Tram

A tram (also known as a streetcar or trolley in the United States and Canada) is a type of urban rail transit consisting of either individual railcars or self-propelled multiple unit trains that run on tramway tracks on urban public streets; some include segments on segregated right-of-way.^[1]^[2]^[3] The tramlines or tram networks operated as public transport are called tramways or simply trams/streetcars. Due to their close similarities, trams are commonly included in the wider term light rail,^[4] which also includes systems separated from other traffic.

Tram vehicles are usually lighter and shorter than main line and rapid transit trains. Most trams use electrical power, usually fed by a pantograph sliding on an overhead line; older systems may use a trolley pole or a bow collector. In some cases, a contact shoe on a third rail is used. If necessary, they may have dual power systems—electricity in city streets and diesel in more rural environments. Occasionally, trams also carry freight. Some trams, known as tram-trains, may have segments that run on mainline railway tracks, similar to interurban systems. The differences between these modes of rail transport are often indistinct and a given system may combine multiple features.

One of the advantages over earlier forms of transit was the low rolling resistance of metal wheels on steel rails, allowing the trams to haul a greater load for a given effort. Another factor which contributed to the rise of trams was the high total cost of ownership of horses. Electric trams largely replaced animal power in the late 19th and early 20th centuries. Improvements in other vehicles such as buses led to decline of trams in early to mid 20th century. However, trams have seen resurgence since the 1980s.

History

Creation

The history of passenger trams, streetcars and trolley systems, began in the early nineteenth century. It can be divided into several distinct periods defined by the principal means of power used. Precursors to the tramway included the wooden or stone wagonways that were used in central Europe to transport mine carts with unflanged wheels since the 1500s, and the paved limestone trackways designed by the Romans for heavy horse and ox-drawn transportation. By the 1700s, paved plateways with cast iron rails were introduced in England for transporting coal, stone or iron ore from the mines to the urban factories and docks.

Horse-drawn

The world's first passenger train or tram was the Swansea and Mumbles Railway, in Wales, UK. The British Parliament passed the Mumbles Railway Act in 1804, and horse-drawn service started in 1807.^[5] The service closed in 1827, but was restarted in 1860, again using horses.^[6] It was worked by steam from 1877, and then, from 1929, by very large (106-seat) electric tramcars, until closure in 1960.^[7] The Swansea and Mumbles Railway was something of a one-off however, and no street tramway appeared in Britain until 1860 when one was built in Birkenhead by the American George Francis Train.^[8]

Street railways developed in America before Europe, due to the poor paving of the streets in American cities which made them unsuitable for horsebuses, which were then common on the well-paved streets of European cities. Running the horsecars on rails allowed for a much smoother ride. There are records of a street railway running in Baltimore as early as 1828, however the first authenticated streetcar in America, was the New York and Harlem Railroad developed by the Irish coach builder John Stephenson, in New York City which began service in the year 1832.^[9]^[10] The New York and Harlem Railroad's Fourth Avenue Line ran along the Bowery and Fourth Avenue in New York City. It was followed in 1835 by the New Orleans and Carrollton Railroad in New Orleans, Louisiana,^[11] which still operates as the St. Charles Streetcar Line. Other American cities did not follow until the 1850s, after which the "animal railway" became an increasingly common feature in the larger towns.^[11]

The first permanent tram line in continental Europe was opened in Paris in 1855 by Alphonse Loubat who had previously worked on American streetcar lines.^[12] The tram was developed in numerous cities of Europe (some of the most extensive systems were found in Berlin, Budapest, Birmingham, Saint Petersburg, Lisbon, London, Manchester, Paris, Kyiv).

The first tram in South America opened in 1858 in Santiago, Chile. The first trams in Australia opened in 1860 in Sydney. Africa's first tram service started in Alexandria on 8 January 1863. The first trams in Asia opened in 1869 in Batavia (Jakarta), Netherlands East Indies (Indonesia).

Limitations of horsecars included the fact that any given animal could only work so many hours on a given day, had to be housed, groomed, fed and cared for day in and day out, and produced prodigious amounts of manure, which the streetcar company was charged with storing and then disposing. Since a typical horse pulled a streetcar for about a dozen miles a day and worked for four or five hours, many systems needed ten or more horses in stable for each horsecar. In 1905 the British newspaper Newcastle Daily Chronicle reported that, "A large number of London's discarded horse tramcars have been sent to Lincolnshire where they are used as sleeping rooms for potato pickers".^[13]

Horsecars were largely replaced by electric-powered trams following the improvement of an overhead trolley system on trams for collecting electricity from overhead wires by Frank J. Sprague. His spring-loaded trolley pole used a wheel to travel along the wire. In late 1887 and early 1888, using his trolley system, Sprague installed the first successful large electric street railway system in Richmond, Virginia. Within a year, the economy of electric power had replaced more costly horsecars in many cities. By 1889, 110 electric railways incorporating Sprague's equipment had been begun or planned on several continents.^[14]

Horses continued to be used for light shunting well into the 20th century, and many large metropolitan lines lasted into the early 20th century. New York City had a regular horsecar service on the Bleecker Street Line until its closure in 1917.^[15] Pittsburgh, Pennsylvania, had its Sarah Street line drawn by horses until 1923. The last regular mule-drawn cars in the US ran in Sulphur Rock, Arkansas, until 1926 and were commemorated by a U.S. postage stamp issued in 1983.^[16] The last mule tram service in Mexico City ended in 1932, and a mule tram in Celaya, Mexico, survived until 1954.^[17] The last horse-drawn tram to be withdrawn from public service in the UK took passengers from Fintona railway station to Fintona Junction one mile away on the main Omagh to Enniskillen railway in Northern Ireland. The tram made its last journey on 30 September 1957 when the Omagh to Enniskillen line closed. The "van" is preserved at the Ulster Transport Museum.

Horse-drawn trams still operate on the 1876-built Douglas Bay Horse Tramway on the Isle of Man, and at the 1894-built horse tram at Victor Harbor in South Australia. New horse-drawn systems have been established at the Hokkaidō Museum in Japan and also in Disneyland. A horse-tram route in Polish gmina Mrozy, first built in 1902, was reopened in 2012.

Steam

The first mechanical trams were powered by steam.^[18] Generally, there were two types of steam tram. The first and most common had a small steam locomotive (called a tram engine in the UK) at the head of a line of one or more carriages, similar to a small train. Systems with such steam trams included Christchurch, New Zealand; Sydney, Australia; other city systems in New South Wales; Munich, Germany (from August 1883 on),^[19] British India (from 1885) and the Dublin & Blessington Steam Tramway (from 1888) in Ireland. Steam tramways also were used on the suburban tramway lines around Milan and Padua; the last Gamba de Legn ("Peg-Leg") tramway ran on the Milan-Magenta-Castano Primo route in late 1957.^[20]

The other style of steam tram had the steam engine in the body of the tram, referred to as a tram engine (UK) or steam dummy (US). The most notable system to adopt such trams was in Paris. French-designed steam trams also operated in Rockhampton, in the Australian state of Queensland between 1909 and 1939. Stockholm, Sweden, had a steam tram line at the island of Södermalm between 1887 and 1901.

Tram engines usually had modifications to make them suitable for street running in residential areas. The wheels, and other moving parts of the machinery, were usually enclosed for safety reasons and to make the engines quieter. Measures were often taken to prevent the engines from emitting visible smoke or steam. Usually the engines used coke rather than coal as fuel to avoid emitting smoke; condensers or superheating were used to avoid emitting visible steam. A major drawback of this style of tram was the limited space for the engine, so that these trams were usually underpowered. Steam trams faded out around the 1890s to 1900s, being replaced by electric trams.

Cable-hauled

Another motive system for trams was the cable car, which was pulled along a fixed track by a moving steel cable. The power to move the cable was normally provided at a "powerhouse" site a distance away from the actual vehicle. The London and Blackwall Railway, which opened for passengers in east London, England, in 1840 used such a system.^[21]

The first practical cable car line was tested in San Francisco, in 1873. Part of its success is attributed to the development of an effective and reliable cable grip mechanism, to grab and release the moving cable without damage. The second city to operate cable trams was Dunedin, from 1881 to 1957.^[22]

The most extensive cable system in the US was built in Chicago in stages between 1859 and 1892. New York City developed multiple cable car lines, that operated from 1883 to 1909.^[23] Los Angeles also had several cable car lines, including the Second Street Cable Railroad, which operated from 1885 to 1889, and the Temple Street Cable Railway, which operated from 1886 to 1898.

From 1885 to 1940, the city of Melbourne, Victoria, Australia operated one of the largest cable systems in the world, at its peak running 592 trams on 75 kilometres (47 mi) of track. There were also two isolated cable lines in Sydney, New South Wales, Australia; the North Sydney line from 1886 to 1900, and the King Street line from 1892 to 1905.

In Dresden, Germany, in 1901 an elevated suspended cable car following the Eugen Langen one-railed floating tram system started operating. Cable cars operated on Highgate Hill in North London and Kennington to Brixton Hill in South London.^[when?] They also worked around "Upper Douglas" in the Isle of Man from 1897 to 1929 (cable car 72/73 is the sole survivor of the fleet).

In Italy, in Trieste, the Trieste–Opicina tramway was opened in 1902, with the steepest section of the route being negotiated with the help of a funicular and its cables.

Cable cars suffered from high infrastructure costs, since an expensive system of cables, pulleys, stationary engines and lengthy underground vault structures beneath the rails had to be provided. They also required physical strength and skill to operate, and alert operators to avoid obstructions and other cable cars. The cable had to be disconnected ("dropped") at designated locations to allow the cars to coast by inertia, for example when crossing another cable line. The cable then had to be "picked up" to resume progress, the whole operation requiring precise timing to avoid damage to the cable and the grip mechanism. Breaks and frays in the cable, which occurred frequently, required the complete cessation of services over a cable route while the cable was repaired. Due to overall wear, the entire length of cable (typically several kilometres) had to be replaced on a regular schedule. After the development of reliable electrically powered trams, the costly high-maintenance cable car systems were rapidly replaced in most locations.

Cable cars remained especially effective in hilly cities, since their nondriven wheels did not lose traction as they climbed or descended a steep hill. The moving cable pulled the car up the hill at a steady pace, unlike a low-powered steam or horse-drawn car. Cable cars do have wheel brakes and track brakes, but the cable also helps restrain the car to going downhill at a constant speed. Performance in steep terrain partially explains the survival of cable cars in San Francisco.

The San Francisco cable cars, though significantly reduced in number, continue to provide regular transportation service, in addition to being a well-known tourist attraction. A single cable line also survives in Wellington (rebuilt in 1979 as a funicular but still called the "Wellington Cable Car"). Another system, with two separate cable lines and a shared power station in the middle, operates from the Welsh town of Llandudno up to the top of the Great Orme hill in North Wales, UK.

Liquid fossil fuel

Hastings and some other tramways, for example Stockholms Spårvägar in Sweden and some lines in Karachi, used petrol trams. Galveston Island Trolley in Texas operated diesel trams due to the city's hurricane-prone location, which would have resulted in frequent damage to an electrical supply system. Although Portland, Victoria promotes its tourist tram^[24] as being a cable car it actually operates using a diesel motor. The tram, which runs on a circular route around the town of Portland, uses dummies and salons formerly used on the Melbourne cable tramway system and since restored.

Gas fossil fuel

In the late 19th and early 20th centuries a number of systems in various parts of the world employed trams powered by gas, naphtha gas or coal gas in particular. Gas trams are known to have operated between Alphington and Clifton Hill in the northern suburbs of Melbourne, Australia (1886–1888); in Berlin and Dresden, Germany; in Estonia (1921–1951); between Jelenia Góra, Cieplice, and Sobieszów in Poland (from 1897); and in the UK at Lytham St Annes, Trafford Park, Manchester (1897–1908) and Neath, Wales (1896–1920).

Comparatively little has been published about gas trams. However, research on the subject was carried out for an article in the October 2011 edition of "The Times", the historical journal of the Australian Association of Timetable Collectors, later renamed the Australian Timetable Association.^[25]^[26]^[27]^[28]

Electric

The world's first electric tram line operated in Sestroretsk near Saint Petersburg invented and tested by inventor Fyodor Pirotsky in 1875.^[29]^[30] Later, using a similar technology, Pirotsky put into service the first public electric tramway in St. Petersburg, which operated only during September 1880.^[31] The second demonstration tramway was presented by Siemens & Halske at the 1879 Berlin Industrial Exposition. The first public electric tramway used for permanent service was the Gross-Lichterfelde tramway in Lichterfelde near Berlin in Germany, which opened in 1881. It was built by Werner von Siemens who contacted Pirotsky. This was the world's first commercially successful electric tram. It drew current from the rails at first, with overhead wire being installed in 1883.^[32]

In Britain, Volk's Electric Railway was opened in 1883 in Brighton. This two kilometer line along the seafront, re-gauged to 2 ft 8+1⁄2 in (825 mm) in 1884, remains in service as the oldest operating electric tramway in the world. Also in 1883, Mödling and Hinterbrühl Tram was opened near Vienna in Austria. It was the first tram in the world in regular service that was run with electricity served by an overhead line with pantograph current collectors. The Blackpool Tramway was opened in Blackpool, UK on 29 September 1885 using conduit collection along Blackpool Promenade. This system is still in operation in modernised form.^[33]

The earliest tram system in Canada was built by John Joseph Wright, brother of the famous mining entrepreneur Whitaker Wright, in Toronto in 1883, introducing electric trams in 1892. In the US, multiple experimental electric trams were exhibited at the 1884 World Cotton Centennial World's Fair in New Orleans, Louisiana, but they were not deemed good enough to replace the Lamm fireless engines then propelling the St. Charles Avenue Streetcar in that city. The first commercial installation of an electric streetcar in the United States was built in 1884 in Cleveland, Ohio, and operated for a period of one year by the East Cleveland Street Railway Company.^[34] The first city-wide electric streetcar system was implemented in 1886 in Montgomery, Alabama, by the Capital City Street Railway Company, and ran for 50 years.^[35]

In 1888, the Richmond Union Passenger Railway began to operate trams in Richmond, Virginia, that Frank J. Sprague had built. Sprague later developed multiple unit control, first demonstrated in Chicago in 1897, allowing multiple cars to be coupled together and operated by a single motorman. This gave rise to the modern subway train. Following the improvement of an overhead "trolley" system on streetcars for collecting electricity from overhead wires by Sprague, electric tram systems were rapidly adopted across the world.^[36]

Earlier electric trains proved difficult or unreliable and experienced limited success until the second half of the 1880s, when new types of current collectors were developed.^[31] Siemens' line, for example, provided power through a live rail and a return rail, like a model train, limiting the voltage that could be used, and delivering electric shocks to people and animals crossing the tracks.^[37] Siemens later designed his own version of overhead current collection, called the bow collector. One of the first systems to use it was in Thorold, Ontario, opened in 1887, and it was considered quite successful. While this line proved quite versatile as one of the earliest fully functional electric streetcar installations, it required horse-drawn support while climbing the Niagara Escarpment and for two months of the winter when hydroelectricity was not available. It continued in service in its original form into the 1950s.^{[citation needed]}

Sidney Howe Short designed and produced the first electric motor that operated a streetcar without gears. The motor had its armature direct-connected to the streetcar's axle for the driving force.^[38]^[39]^[40]^[41]^[42] Short pioneered "use of a conduit system of concealed feed" thereby eliminating the necessity of overhead wire and a trolley pole for street cars and railways.^[43]^[38]^[39] While at the University of Denver he conducted experiments which established that multiple unit powered cars were a better way to operate trains and trolleys.^[38]^[39]

Electric tramways spread to many European cities in the 1890s, such as:

Prague, Bohemia (then in the Austro-Hungarian Empire), in 1891;
Kyiv, Ukraine, in 1892;
Dresden, Germany; Lyon, France; and Milan and Genoa, Italy, in 1893;
Rome, Italy: Plauen, Germany; Bucharest, Romania;^[44] Lviv, Ukraine; Belgrade, Serbia in 1894;
Bristol, United Kingdom; and Munich, Germany in 1895;
Bilbao, Spain, in 1896;
Copenhagen, Denmark; and Vienna, Austria, in 1897;
Florence and Turin, Italy, in 1898;
Helsinki, Finland; and Madrid and Barcelona, Spain, in 1899.^[31]

Sarajevo built a citywide system of electric trams in 1895.^[45] Budapest established its tramway system in 1887, and its ring line has grown to be the busiest tram line in Europe, with a tram running once per minute at rush hour. Bucharest and Belgrade^[46] ran a regular service from 1894.^[47]^[48] Ljubljana introduced its tram system in 1901 – it closed in 1958.^[49] Oslo had the first tramway in Scandinavia, starting operation on 2 March 1894.^[50]

The first electric tramway in Australia was a Sprague system demonstrated at the 1888 Melbourne Centennial Exhibition in Melbourne; afterwards, this was installed as a commercial venture operating between the outer Melbourne suburb of Box Hill and the then tourist-oriented country town Doncaster from 1889 to 1896.^[51] Electric systems were also built in Adelaide, Ballarat, Bendigo, Brisbane, Fremantle, Geelong, Hobart, Kalgoorlie, Launceston, Leonora, Newcastle, Perth, and Sydney.

By the 1970s, the only full tramway system remaining in Australia was the Melbourne tram system. However, there were also a few single lines remaining elsewhere: the Glenelg tram line, connecting Adelaide to the beachside suburb of Glenelg, and tourist trams in the Victorian Goldfields cities of Bendigo and Ballarat. In recent years the Melbourne system, generally recognised as the largest urban tram network in the world, has been considerably modernised and expanded.^[52] The Adelaide line has been extended to the Entertainment Centre, and work is progressing on further extensions.^[53] Sydney re-introduced trams (or light rail) on 31 August 1997. A completely new system, known as G:link, was introduced on the Gold Coast, Queensland, on 20 July 2014. The Newcastle Light Rail opened in February 2019, while the Canberra light rail opened on 20 April 2019.^[54] This is the first time that there have been trams in Canberra, even though Walter Burley Griffin's 1914–1920 plans for the capital then in the planning stage did propose a Canberra tram system.^[55]

In Japan, the Kyoto Electric railroad was the first tram system, starting operation in 1895.^[56] By 1932, the network had grown to 82 railway companies in 65 cities, with a total network length of 1,479 km (919 mi).^[57] By the 1960s the tram had generally died out in Japan.^[58]^[59]

Two rare but significant alternatives were conduit current collection, which was widely used in London, Washington, D.C., and New York City, and the surface contact collection method, used in Wolverhampton (the Lorain system), Torquay and Hastings in the UK (the Dolter stud system), and in Bordeaux, France (the ground-level power supply system). ^{[citation needed]}

The convenience and economy of electricity resulted in its rapid adoption once the technical problems of production and transmission of electricity were solved. Electric trams largely replaced animal power and other forms of motive power including cable and steam, in the late 19th and early 20th centuries.^{[citation needed]}

There was one particular hazard associated with trams powered from a trolley pole off an overhead line on the early electrified systems. Since the tram relies on contact with the rails for the current return path, a problem arises if the tram is derailed or (more usually) if it halts on a section of track that has been heavily sanded by a previous tram, and the tram loses electrical contact with the rails. In this event, the underframe of the tram, by virtue of a circuit path through ancillary loads (such as interior lighting), is live at the full supply voltage, typically 600 volts DC. In British terminology, such a tram was said to be 'grounded'—not to be confused with the US English use of the term, which means the exact opposite. Any person stepping off the tram and completing the earth return circuit with their body could receive a serious electric shock. If "grounded", the driver was required to jump off the tram (avoiding simultaneous contact with the tram and the ground) and pull down the trolley pole, before allowing passengers off the tram. Unless derailed, the tram could usually be recovered by running water down the running rails from a point higher than the tram, the water providing a conducting bridge between the tram and the rails.^{[citation needed]} With improved technology, this ceased to be an problem.

In the 2000s, several companies introduced catenary-free designs: Alstom's Citadis line uses a third rail, Bombardier's PRIMOVE LRV is charged by contactless induction plates embedded in the trackway and CAF URBOS tram uses ultracaps technology^[60]^[61]

Battery

As early as 1834, Thomas Davenport, a Vermont blacksmith, had invented a battery-powered electric motor which he later patented. The following year he used it to operate a small model electric car on a short section of track four feet in diameter.^[62]^[63]

Attempts to use batteries as a source of electricity were made from the 1880s and 1890s, with unsuccessful trials conducted in among other places Bendigo and Adelaide in Australia, and for about 14 years as The Hague accutram of HTM in the Netherlands. The first trams in Bendigo, Australia, in 1892, were battery-powered, but within as little as three months they were replaced with horse-drawn trams. In New York City some minor lines also used storage batteries. Then, more recently during the 1950s, a longer battery-operated tramway line ran from Milan to Bergamo. In China there is a Nanjing battery Tram line and has been running since 2014.^[64] In 2019, the West Midlands Metro in Birmingham, England adopted battery-powered trams on sections through the city centre close to Grade I listed Birmingham Town Hall.

Compressed air

Paris and Berne (Switzerland) operated trams that were powered by compressed air using the Mekarski system.^[65]^[66] Trials on street tramways in Britain, including by the North Metropolitan Tramway Company between Kings Cross and Holloway, London (1883), achieved acceptable results but were found not to be economic because of the combined coal consumption of the stationary compressor and the onboard steam boiler.^[67]^[68]

Human power

The Convict Tramway^[70] was hauled by human power in the form of convicts from the Port Arthur convict settlement.^[71] and was created to replace the hazardous sea voyage from Hobart to Port Arthur, Tasmania.^[72]^[70] Charles O'Hara Booth oversaw the construction of the tramway.^[73]

It opened in 1836 and ran for 8 km (5.0 mi) from Oakwood to Taranna.^[74] By most definitions, the tramway was the first passenger-carrying railway/tramway in Australia.^[72] An unconfirmed report says that it continued to Eaglehawk Neck and, if this was so, the length of the tramway would have been more than doubled. The tramway carried passengers and freight, and ran on wooden rails. The gauge is unknown. The date of closure is unknown, but it was certainly prior to 1877.^[75]

Hydrogen

In March 2015, China South Rail Corporation (CSR) demonstrated the world's first hydrogen fuel cell vehicle tramcar at an assembly facility in Qingdao. The chief engineer of the CSR subsidiary CSR Sifang Co Ltd., Liang Jianying, said that the company is studying how to reduce the running costs of the tram.^[76]^[77]

Hybrid system

The Trieste–Opicina tramway in Trieste operates a hybrid funicular tramway system. Conventional electric trams are operated in street running and on reserved track for most of their route. However, on one steep segment of track, they are assisted by cable tractors, which push the trams uphill and act as brakes for the downhill run. For safety, the cable tractors are always deployed on the downhill side of the tram vehicle.

Similar systems were used elsewhere in the past, notably on the Queen Anne Counterbalance in Seattle and the Darling Street wharf line in Sydney.

Modern development

In the mid-20th century many tram systems were disbanded, replaced by buses, trolleybuses, automobiles or rapid transit. The General Motors streetcar conspiracy was a case study of the decline of trams in the United States. In the 21st century, trams have been re-introduced in cities where they had been closed down for decades (such as Tramlink in London), or kept in heritage use (such as Spårväg City in Stockholm). Most trams made since the 1990s (such as the Bombardier Flexity series and Alstom Citadis) are articulated low-floor trams with features such as regenerative braking.

Design

Trams have been used for two main purposes: for carrying passengers and for carrying cargo. There are several types of passenger tram:

Operation

There are two main types of tramways, the classic tramway built in the early 20th century with the tram system operating in mixed traffic, and the later type which is most often associated with the tram system having its own right of way. Tram systems that have their own right of way are often called light rail but this does not always hold true. Though these two systems differ in their operation, their equipment is much the same.

Controls

Trams were traditionally operated with separate levers for applying power and brakes. More modern vehicles use a locomotive-style controller which incorporate a dead man's switch. The success of the PCC streetcar had also seen trams use automobile-style foot controls allowing hands-free operation, particularly when the driver was responsible for fare collection.

Power supply

Electric trams use various devices to collect power from overhead lines. The most common device is the pantograph, while some older systems use trolley poles or bow collectors. Ground-level power supply has become a more recent innovation. Another technology uses supercapacitors; when an insulator at a track switch cuts off power from the tram for a short distance along the line, the tram can use energy stored in a large capacitor to drive the tram past the gap in the power feed.^[78] The old tram systems in London, Manhattan (New York City), and Washington, D.C., used live rails, like those on third-rail electrified railways, but in a conduit underneath the road, from which they drew power through a plough. It was called conduit current collection. Washington's was the last of these to close, in 1962. No commercial tramway uses this system anymore. More recently, an equivalent to these systems has been developed which allows for the safe installation of a third rail on city streets, known as surface current collection or ground-level power supply; the main example of this is the new tramway in Bordeaux.

Ground-level power supply

A section of APS track in Bordeaux with powered and neutral sections

A ground-level power supply system, also called surface current collection or alimentation par le sol (APS), is an updated version of the original stud type system. APS uses a third rail placed between the running rails, divided electrically into eight-metre powered segments with three-metre neutral sections between. Each tram has two power collection skates, next to which are antennas that send radio signals to energize the power rail segments as the tram passes over them.

Older systems required mechanical switching systems which were susceptible to environmental problems. At any one time no more than two consecutive segments under the tram should be live. Wireless and solid state switching eliminate mechanical problems.

Alstom developed the system primarily to avoid intrusive power supply cables in the sensitive area of the old city of old Bordeaux.^[79]

Routes

Route patterns vary greatly among the world's tram systems, leading to different network topologies.

Most systems start by building up a strongly nucleated radial pattern of routes linking the city centre with residential suburbs and traffic hubs such as railway stations and hospitals, usually following main roads. Some of these, such as those in Hong Kong, Blackpool and Bergen, still essentially comprise a single route. Some suburbs may be served by loop lines connecting two adjacent radial roads. Some modern systems have started by reusing existing radial railway tracks, as in Nottingham and Birmingham, sometimes joining them together by a section of street track through the city centre, as in Manchester. Later developments often include tangential routes linking adjacent suburbs directly, or multiple routes through the town centre to avoid congestion (as in Manchester's Second City Crossing).
Other new systems, particularly those in large cities which already have well-developed metro and suburban railway systems, such as London and Paris, have started by building isolated suburban lines feeding into railway or metro stations. In Paris these have then been linked by ring lines.
A third, weakly nucleated, route pattern may grow up where a number of nearby small settlements are linked, such as in the coal-mining areas served by BOGESTRA or the Silesian Interurbans.
A fourth starting point may be a loop in the city centre, sometimes called a downtown circulator, as in Portland or El Paso.
Occasionally a modern tramway system may grow from a preserved heritage line, as in Stockholm.

The resulting route patterns are very different. Some have a rational structure, covering their catchment area as efficiently as possible, with new suburbs being planned with tramlines integral to their layout – such is the case in Amsterdam. Bordeaux and Montpellier have built comprehensive networks, based on radial routes with numerous interconnections, within the last two decades. Some systems serve only parts of their cities, with Berlin being the prime example, owing to the fact that trams survived the city's political division only in the Eastern part. Other systems have ended up with a rather random route map, for instance when some previous operating companies have ceased operation (as with the tramways vicinaux/buurtspoorwegen in Brussels) or where isolated outlying lines have been preserved (as on the eastern fringe of Berlin). In Rome, the remnant of the system comprises three isolated radial routes, not connecting in the ancient city centre, but linked by a ring route. Some apparently anomalous lines continue in operation where a new line would not on rational grounds be built, because it is much more costly to build a new line than to continue operating an existing one.

In some places, the opportunity is taken when roads are being repaved to lay tramlines (though without erecting overhead cables) even though no service is immediately planned: such is the case in Leipzigerstraße in Berlin, the Haarlemmer Houttuinen in Amsterdam, and Botermarkt in Ghent.

Cross-border trams

Tram systems operate across national borders in Basel (from Switzerland into France and Germany), Geneva (from Switzerland into France) and Strasbourg (from France into Germany). A planned line linking Hasselt (Belgium) with Maastricht (Netherlands) was cancelled in June 2022.

Route-setting

Where tracks diverge, the driver chooses the route, usually either by flicking a switch on the dashboard or by use of the power pedal – generally if power is applied the tram goes straight on, whereas if no power is applied the tram turns. Some systems use automatic point-setting systems, where the route for each journey is downloaded from a central computer, and an onboard computer actuates each point as it comes to it via an induction loop. Such is the case at Manchester Metrolink.^[80] If the powered system breaks down, most points may be operated manually, by inserting a metal lever ('point iron') into the point machine.

Track

Tramway track can have different rail profiles to accommodate the various operating environments of the vehicle. They may be embedded into concrete for street-running operation, or use standard ballasted track with railroad ties on high-speed sections. A more ecological solution is to embed tracks into grass turf, an approach known as green track.

Tramway tracks use a grooved rail with a groove designed for tramway or railway track in pavement or grassed surfaces (grassed track or track in a lawn). The rail has the railhead on one side and the guard on the other. The guard provides accommodation for the flange. The guard carries no weight, but may act as a checkrail. Grooved rail was invented in 1852 by Alphonse Loubat, a French inventor who developed improvements in tram and rail equipment, and helped develop tram lines in New York City and Paris. The invention of grooved rail enabled tramways to be laid without causing a nuisance to other road users, except unsuspecting cyclists, who could get their wheels caught in the groove. The grooves may become filled with gravel and dirt (particularly if infrequently used or after a period of idleness) and need clearing from time to time, this being done by a "scrubber" tram. Failure to clear the grooves can lead to a bumpy ride for the passengers, damage to either wheel or rail and possibly derailing.

In narrow situations double-track tram lines sometimes reduce to single track, or, to avoid switches, have the tracks interlaced, e.g. in the Leidsestraat in Amsterdam on three short stretches (see map detail); this is known as interlaced or gauntlet track. There is a UK example of interlaced track on the Tramlink, just west of Mitcham Station, where the formation is narrowed by an old landslip causing an obstruction. (See photo in Tramlink entry).

Track gauge

Historically, the track gauge has had considerable variations, with narrow gauge common in many early systems. However, most light rail systems are now standard gauge. An important advantage of standard gauge is that standard railway maintenance equipment can be used on it, rather than custom-built machinery. Using standard gauge also allows light rail vehicles to be delivered and relocated conveniently using freight railways and locomotives.

Another factor favoring standard gauge is that low-floor vehicles are becoming popular, and there is generally insufficient space for wheelchairs to move between the wheels in a narrow gauge layout. Standard gauge also enables – at least in theory – a larger choice of manufacturers and thus lower procurement costs for new vehicles. However, other factors such as electrification or loading gauge for which there is more variation may require costly custom built units regardless.

Tram stop

Tram stops can range from purpose-built, tram-exclusive facilities (left), to simple stops within a public road (right).

Tram stops may be similar to bus stops in design and use, particularly in street-running sections, where in some cases other vehicles are legally required to stop clear of the tram doors. Some stops may have railway platforms, particularly in private right-of-way sections and where trams are boarded at standard railway platform height, as opposed to using steps at the doorway or low-floor trams.

Manufacturing

Approximately 5,000 new trams are manufactured each year. As of February 2017, 4,478 new trams were on order from their makers, with options being open for a further 1,092.^[81]

The main manufacturers are:

Trams on order as February 2017
Manufacturer	Firm orders	Options
Bombardier	962	296
Alstom	650	202
Siemens	557	205
CAF	411	112
CRRC	370	30
PKTS/Metrovagonmash	316
Kinkisharyo	155	97
Stadler-Vossloh	189	25
Stadler	182	28
Škoda Transtech	104	47
Škoda	110
Durmazlar	90

Debate

Advantages

Trams (and road public transport in general) can be much more efficient in terms of road usage than cars – one vehicle replaces about 40 cars (which take up a far larger area of road space).^[82]^[83]

Vehicles run more efficiently compared to similar vehicles that use rubber tyres, since the rolling resistance of steel on steel is lower than rubber on asphalt.^[84]
Being guided by rails means that even very long tram units can navigate tight, winding city streets that are inaccessible to long buses.
Tram vehicles are very durable, with some being in continuous revenue service for more than fifty years. This is especially true compared to internal combustion buses, which tend to require high amounts of maintenance and break down after less than 20 years, mostly due to the vibrations of the engine.
In many cases tram networks have a higher capacity than similar buses. This has been cited as a reason for the replacement of one of Europe's busiest bus lines (with three-minute headways in peak times) with a tram by Dresdner Verkehrsbetriebe.
Due to the above-mentioned capacity advantage, labor costs (which form the biggest share of operating costs of many public transit systems) per passenger can be significantly lower compared to buses.
Trams and light rail systems can be cheaper to install than subways or other forms of heavy rail. In Berlin the commonly cited figure is that one kilometer of subway costs as much as ten kilometers of tramway.
ULR Ultra Light Rail developments with prefabricated track and onboard power (no OHL Over Head Line) in the UK are aiming for £10 m per km^[85] as opposed to convention tram rail and OHL at £20–£30 m per km.^[86]
Tramways can take advantage of old heavy rail alignments. Some examples include the Manchester Metrolink of which the Bury Line was part of the East Lancashire Railway, the Altrincham Line was part of the Manchester South Junction and Altrincham Railway, and the Oldham and Rochdale Line was the Oldham Loop Line. Other examples can be found in Paris, London, Boston, Melbourne and Sydney. They hence sometimes take advantage of high speed track while on train tracks.
As tram lines are permanent this allows local authorities to redevelop and revitalise their towns and cities provided suitable planning changes are made.^[87] Melbourne will allow higher buildings (5 to 6 story) along tram routes leaving the existing suburbs behind unchanged whilst doubling the cities density.^[88]
The tram with its fixed route gives developers confidence to invest as opposed to a changeable bus route.
Trams produce less air pollution than rubber tyred transport which produce tyre, asphalt and brake based pollutants. The use of regenerative electric motor braking in trams lowers mechanical brake use. Steel wheel and rail particulates are produced but regular wheel alignment and flexible track mounting can reduce emissions.
Tram networks can link to other operational heavy rail and rapid transit systems, allowing vehicles to move directly from one to the other without passengers needing to alight. Trams that are compatible with heavy rail systems are called tram-trains, while those that can use subway tunnels are called pre-metro or Stadtbahn.
Passengers can reach surface stations quicker than underground stations. Subjective safety at surface stations is often seen to be higher.
Trams can be tourist attractions in ways buses usually are not.
Many modern tram systems plant low growing vegetation – mostly grasses – between the tracks which has a psychological effect on perceived noise levels and the benefits of greenspace. This is not possible for buses as they deviate too much from an "ideal" track in daily operations.
There is a well studied effect that the installation of a tram service – even if service frequency, speed and price all remain constant – leads to higher ridership and mode shift away from cars compared to buses. Conversely, the abandonment of tram service leads to measurable declines in ridership.

Disadvantages

Installing rails for tram tracks and overhead lines for power means a higher up-front cost than using buses which require no modifications to streets to begin operations.
Tram tracks can be hazardous for cyclists, as bikes, particularly those with narrow tyres, may get their wheels caught in the track grooves.^[89] It is possible to close the grooves of the tracks on critical sections by rubber profiles that are pressed down by the wheelflanges of the passing tram but that cannot be lowered by the weight of a cyclist.^[90] If not well-maintained, however, these lose their effectiveness over time.^{[citation needed]}
When wet, tram tracks tend to become slippery and thus dangerous for bicycles and motorcycles, especially in traffic.^[89]^[91] In some cases, even cars can be affected.^[92]
The opening of new tram and light rail systems has sometimes been accompanied by a marked increase in car accidents, as a result of drivers' unfamiliarity with the physics and geometry of trams.^[93] Though such increases may be temporary, long-term conflicts between motorists and light rail operations can be alleviated by segregating their respective rights-of-way and installing appropriate signage and warning systems.^[94]
Rail transport can expose neighbouring populations to moderate levels of low-frequency noise. However, transportation planners use noise mitigation strategies to minimise these effects.^[95] Most of all, the potential for decreased private motor vehicle operations along the tram's service line because of the service provision could result in lower ambient noise levels than without.
The overhead power lines and supporting poles utilized by trams (except for those using a third rail) can be unsightly and contribute to visual pollution.^[96]

By region

Trams are in a period of growth, with about 800 tram systems operating around the world, 10 or so new systems being opened each year, and many being gradually extended.^[98] Some of these systems date from the late 19th or early 20th centuries. In the past 20 years their numbers have been augmented by modern tramway or light rail systems in cities that had abandoned this form of transport. There have also been some new tram systems in cities that never previously had them.

Tramways with tramcars (British English) or street railways with streetcars (North American English) were common throughout the industrialised world in the late 19th and early 20th centuries but they had disappeared from most British, Canadian, French and US cities by the mid-20th century.^[99]

By contrast, trams in parts of continental Europe continued to be used by many cities, although there were declines in some countries, including the Netherlands.^[100]

Since 1980 trams have returned to favour in many places, partly because their tendency to dominate the roadway, formerly seen as a disadvantage, is considered to be a merit since it raises the visibility of public transport (encouraging car users to change their mode of travel), and enables streets to be reconfigured to give more space to pedestrians, making cites more pleasant places to live. New systems have been built in the United States, United Kingdom, Ireland, Italy, France, Australia and many other countries.

In Milan, Italy, the old "Ventotto" trams are considered a "symbol" of the city. The same can be said of trams in Melbourne in general, but particularly the iconic W class. The Toronto streetcar system had similarly become an iconic symbol of the city, operating the largest network in the Americas as well as the only large-scale tram system in Canada (not including light rail systems, or heritage lines).^[101]^[102]

Major tram and light rail systems

Existing systems

The largest tram (classic tram, streetcar, straßenbahn) and fast tram (light rail, stadtbahn) networks in the world by route length as of 2016^[103] are:

Melbourne (256 km; 159 mi)^[104]
Saint Petersburg (205.5 km; 127.7 mi)^[105]
Cologne (194.8 km; 121.0 mi)^[106]^[107]
Berlin (191.6 km; 119.1 mi)^[108]
Moscow (183 km; 114 mi)^[109]
Milan (181.8 km; 113.0 mi)^[110]
Budapest (172 km; 107 mi)^[111]
Katowice agglomeration (171 km; 106 mi)^[112]
Vienna (170 km; 110 mi).^[113]

Other large transit networks that operate streetcar and light rail systems include:

Dallas Light Rail,^[114] modern streetcar^[115] and heritage streetcar^[116] (155 km; 96 mi)
Sofia (153.6 km; 95.4 mi)^[103]
Warsaw (150 km; 93 mi)
Leipzig (148.3 km; 92.1 mi)^[117]
Brussels (147.1 km; 91.4 mi)^[118]
Łódź (145 km; 90 mi)^[119]
Bucharest (143 km; 89 mi)^[120]
Prague (142.4 km; 88.5 mi)^[121]
Dresden (134 km; 83 mi)
Los Angeles (133.1 km; 82.7 mi)^[122]

Statistics

Tram and light rail systems operate in 388 cities across the world, 206 of which are in Europe;
The longest single tram line and route in the world is the 68 km (42 mi) interurban Belgian Coast Tram (Kusttram), which runs almost the entire length of the Belgian coast. Another fairly long interurban line is the Valley Metro Rail agglomeration of Phoenix, Arizona, with its 42 km (26 mi).^[123]^[124] The world's longest urban intracity tram line is 33 km (21 mi) counter-ring routes 5/5a in Kazan (Tatarstan, Russia).

Since 1985, 120 light rail systems have opened;
Since 2000, 78 systems have opened while 13 have closed. The countries that have opened the most systems since 2000 are the US (23), France (20), Spain (16), and Turkey (8);
15,618 km (9,705 mi) of track is in operation, with 850 km (530 mi) in construction and a further 2,350 km (1,460 mi) planned;
The longest systems are in Melbourne (254 km or 158 mi), Saint Petersburg (228 km or 142 mi), Katowice (Upper Silesian Industrial Region) (200 km or 120 mi), Cologne (193 km or 120 mi), Berlin (192 km or 119 mi), Milan (182 km or 113 mi), Budapest (172 km or 107 mi), and Vienna (170 km or 110 mi).
These lines have 32,345 stops at an average spacing of 484 metres;
They carry 13.5 billion passengers a year, 3% of all public transport passengers. The highest-volume systems are Budapest (396 million passengers a year), Prague (372 m),^[125] Bucharest (322 m), Saint Petersburg (312 m), and Vienna (305 m);
The most busy networks (passengers per km, per year) are: Istanbul, Hong Kong, Tokyo and Sarajevo.
Just over 36,000 trams and light rail vehicles are in operation. The largest fleets are in Prague (788), Vienna (782), Warsaw (756), Saint-Petersburg (750), Moscow (632)
Between 1997 and 2014, 400–450 vehicles were built each year.
As of October 2015, Hong Kong has the world's only exclusively double-decker tramway system.^[126]
The busiest junction in any tram network is the Lazarská x Spálená junction in Prague with appx. 150 vehicles passing through per hour.^[127]
World's longest 9-sectioned 56 metres (184 ft)-meter articulated tram vehicle CAF Urbos 3/9 started operation in Budapest in 2016. Škoda ForCity vehicles family allows expansion of length up to 72 metres (236 ft) with 539 passengers.

Historical

Historically, the Paris Tram System was, at its peak, the world's largest system, with 1,111 km (690 mi) of track in 1925^{[citation needed]} (according to other sources, ca. 640 km (400 mi) of route length in 1930). However it was completely closed in 1938.^[128] The next largest system appears to have been 857 km (533 mi), in Buenos Aires before 19 February 1963. The third largest was Chicago, with over 850 km (530 mi) of track,^[129] but it was all converted to trolleybus and bus services by 21 June 1958. Before its decline, the BVG in Berlin operated a very large network with 634 km (394 mi) of route. Before its system was converted to trolleybus (and later bus) services in the 1930s (last tramway closed 6 July 1952), the first-generation London network had 555 km (345 mi) of route in 1931.^[130] In 1958 trams in Rio de Jainero were employed on (433 km; 269 mi) of track. The final line, the Santa Teresa route was closed in 1968.^[131] During a period in the 1980s, the world's largest tram system was in Leningrad (St. Petersburg) with 350 km (220 mi), USSR, and was included as such in the Guinness World Records;^{[citation needed]} however Saint Petersburg's tram system has declined in size since the fall of the Soviet Union. Vienna in 1960 had 340 km (211 mi), before the expansion of bus services and the opening of a subway (1976). Substituting subway services for tram routes continues. 320 km (199 mi) was in Minneapolis–Saint Paul in 1947: There streetcars ended 31 October 1953 in Minneapolis and 19 June 1954 in St. Paul.^[132] The Sydney tram network, before it was closed on 25 February 1961, had 291 km (181 mi) of route, and was thus the largest in Australia. Since 1961, the Melbourne system (recognised as the world's largest) assumed Sydney's title as the largest network in Australia.

Africa

Asia

Tramway systems were well established in the Asian region at the start of the 20th century but started a steady decline during the mid to late 1930s. The 1960s marked the end of its dominance in public transportation with most major systems closed and the equipment and rails sold for scrap; however, some extensive original systems still remain in service in Japan. In recent years there has been renewed interest in the tram with modern systems being built in Japan and China.

Tram services in China existed in several cities during the 20th century; however, by the end of the century, only the systems in Dalian, Hong Kong, and Changchun remained extant. The 21st century has seen a resurgence in the development of tram transport as China struggles with urban traffic congestion and pollution with at least 15 systems operating. Hong Kong has an exclusive fleet of double-decker trams. As of 2019, Wuyishan, Baoshan, Jiaxing, and Haikou have new tram systems under construction.
The first Japanese tram line was inaugurated in 1895 as the Kyoto Electric Railroad. The tram reached its zenith in 1932 when 82 rail companies operated 1,479 kilometres of track in 65 cities. The tram declined in popularity through the remaining years of the 1930s and during the 1960s many of the remaining operational tramways were shut down or converted into commuter railway lines.

In India, the tram service in Kolkata is the only active service, with a gauge up to 30 km (19 mi) across the city. Trams were discontinued in Chennai in 1954 and in Mumbai in 1960. Tram service was started in 1884 in Karachi but was closed in 1975.^[133]^[134]
The Northern and Central areas of the City of Colombo in Sri Lanka had an electric Tram Car system (3 ft 6 in or 1,067 mm gauge). This system commenced operations about 1900 and was discontinued by 1960. However, a new tram system is being brought to Colombo as part of the plan of Western Region Megapolis.
The 13-kilometre-long Jerusalem Light Rail system began operation in August 2011 and is being extended, with the full system expected to be in operation by 2023. A significant portion of it will be underground. A light rail system for Beersheba is also planned.
In Thailand, an extensive tram system ran in Bangkok from 1888, until it was suspended in 1968. A smaller single-route tram route tram in Lopburi was also suspended in the early 1960s.
Other countries with discontinued tram systems include Indonesia, Singapore, Malaysia, Pakistan, Philippines, and Vietnam.
A tram system is planned for construction in Gwadar, Pakistan, where construction started in late 2011.
Trams are also under construction in DHA City, Karachi.
Several Tram systems are under construction or proposed in Taiwan, mostly in Kaohsiung (Phase III) and Taipei (New Taipei City). The First LRT system was established in Kaohsiung (Circular LRT), followed by the Danhai Light Rail Transit in Northern Taiwan.

Indonesia

In Batavia (Jakarta), the capital of the former Dutch colony of the Netherlands East Indies, a horse tram service started in 1869. A steam tram ran from 1881, and electrification followed in 1897. All Jakarta trams were discontinued in the 1960s by an independent Indonesia due to pressure from Sukarno, who saw tram network as "antiquated" and a "relic of [the] colonial era". The other cities in Indonesia who used to have urban tram network were Surabaya and Semarang.
The Semarang tram network was constructed between 1882 and 1883, essentially as an inner suburb extension of the Samarang Joana Railway (SJS) network. The company already had an extensive rural tram network to the east of Semarang. Due to financial difficulties that hampered the SJS railway company, the Semarang tram network was closed in 1940 (despite public protest in Semarang) and their rolling stock transferred to the Surabaya tram network.
Surabaya's tram network was built in 1886. Initially consisting of steam trams only, electric trams were added in 1923. They served Surabaya commuters well into the independence era. The electric tram bowed out from service in 1968, while its steam counterpart outlived the electrics, becoming the world's last urban steam tram service before its closure in 1978.
In 2012, there was talk of reviving Surabaya's tram network as a part of Surabaya Mass Rapid Transit project, which will see parts of the old electric tram right of way reactivated, and it will be combined with the future monorail network. The project is aimed to alleviate Surabaya's traffic congestion and provide cheap public transportation for Surabaya commuters. In 2014, the project entered the tender phase.

Europe

In many European cities, tramway infrastructure was lost during the mid-20th century, though not always on the same scale as in other parts of the world such as North America. Most of Central and Eastern Europe retained the majority of its tramway systems and it is here that the largest and busiest tram systems in the world are found. Germany and France have the most tram systems, with over 50 and over 30 networks.

Urban public transportation has been experiencing a sustained revival since the 1990s. Many European cities are rehabilitating, upgrading, expanding and reconstructing their old tramway lines and building new tramway lines.^[135] In 2014, the Aubagne tramway in Southern France became the first tram system in the world not to charge fares.^[136]

Great Britain

In the UK, most of the old Victorian era tramways were decommissioned from the 1950s–70s and replaced by buses. The exceptions were Blackpool Tramway, opened in 1885 and one of the few tramways to use double decker trams in the 21st century, and Great Orme Tramway which has operated at Llandudno since 1902.^[137]

Since the early 2000s, tramways have been restored in many cities to reduce commuters' dependency on cars. These include Edinburgh Tramway, Manchester Metrolink, and Nottingham Tramway.

Many decommissioned trams are preserved at transport museums and heritage railways. The first of these was Seaton Tramway, which opened in 1971 but dates back to 1949. Other preserved tramways include Crich Tramway (opened 1963), East Anglia Transport Museum (opened 1965), Heaton Tramway (opened 1979), Telford steam tram (opened 1980), and Wirral Tramway (opened 1995). Additionally, Beamish Museum has reconstructed a turn of the century tramway using original rails and preserved tramcars.^[138]

North America

In North America, these vehicles are called "streetcars" (or "trolleys" in parts of the United States); the term tram is more likely to be understood as an aerial tramway or a people-mover, though "tram" may be used colloquially in Canada. Streetcar systems were developed in late 19th to early 20th centuries in a number of cities throughout North America. However, most North American cities saw their streetcar lines removed in the mid-20th century for a variety of financial, technological and social reasons. Exceptions included Boston,^[139] Cleveland, Mexico City, New Orleans, Newark, Philadelphia, Pittsburgh, San Francisco, and Toronto.

Canada

Toronto operates the largest streetcar system in the Americas in terms of track length and ridership. Operated by the Toronto Transit Commission, the system consists of both street-running and grade-separated tramways. The streetcar system was established in 1861, and used a variety of vehicles in its history, including horse-drawn streetcars, Peter Witt streetcars, the PCC streetcar, and the Canadian Light Rail Vehicle and its articulated counterpart, the Articulated Light Rail Vehicle. Since 29 December 2019,^[140] the system exclusively uses the Flexity Outlook made by Bombardier Transportation.^[141]^[142]^[143]^[144]

Streetcars once existed in the Canadian cities of Calgary, Edmonton, Halifax, Hamilton, Kingston, Kitchener, London, Montreal, Ottawa, Peterborough, Quebec City, Regina, Saskatoon, Windsor, Winnipeg, St. John's and Vancouver. However, Canadian cities excluding Toronto, removed their streetcar systems in the mid-20th century. In the late 1970s and early 1980s, light rail systems were introduced in Calgary and Edmonton; with another light rail system established in Ottawa in 2001. There has been something of a renaissance for light railways in mid-sized cities with Waterloo, Ontario the first to come on line and construction underway in Mississauga, Ontario and Hamilton, Ontario. In the late 20th century, several Canadian locales restored portions of their defunct streetcar lines, operating them as a heritage feature for tourists. Heritage streetcar lines in Canada include the High Level Bridge Streetcar in Edmonton, the Nelson Electric Tramway in Nelson, and the Whitehorse Waterfront Trolley in Whitehorse.

United States

Pittsburgh had kept most of its streetcar system serving the city and suburbs, making it the longest-lasting large-network streetcar system in the United States.^{[citation needed]} However, most of the city's streetcar lines had been abandoned by the early 1970s, and the handful of surviving streetcar lines were converted to light rail in the 1980s. San Francisco's Muni Metro system is the largest surviving streetcar system in the United States, and has even revived previously closed streetcar lines such as the F Market & Wharves heritage streetcar line. In the late 20th century, several cities installed modern light rail systems, some along the same corridors as their old streetcars systems, the first of these being the San Diego Trolley in San Diego in 1981.

In the 1980s, some cities in the United States brought back streetcar lines, including Memphis, Tampa, and Little Rock; However, these streetcar systems were designed as heritage streetcar lines, and used vintage or replica-vintage vehicles. The first "second-generation streetcar system" in North America was opened in Portland in 2001.^[145] The system utilizes modern vehicles that feature low-floor streetcars. These newer streetcar systems were built in several American cities in the early 21st century including Atlanta, Charlotte, Cincinnati, Dallas, Detroit, Kansas City, Milwaukee, Oklahoma City, Seattle, Tucson, and Washington, D.C.

Oceania

Australia

Historically, there have been trams in the following Australian cities and towns: Adelaide, Ballarat, Bendigo, Brisbane, Broken Hill, Derby, Fremantle, Gawler, Geelong, Hobart, Kalgoorlie, Launceston, Leonora, Maitland, Melbourne, Moonta–Wallaroo, Newcastle, Perth, Rockhampton, Sorrento, Sydney and Victor Harbor. They ranged from extensive systems to single lines. Virtually all known types of motive power have been utilised in Australia at some stage.
The Sydney system, which closed in 1961, was the most extensive and the largest passenger carrier of any Australian public transport system then or since, moving over 400 million passengers per annum, at its peak. In 1997, Sydney reintroduced tram services on a modern light rail network; the 2010s saw a significant expansion of the network.
Melbourne and Adelaide were the only major cities in Australia to retain trams (although Adelaide only retained a single line and dismantled the rest of its network). Other cities had largely dismantled their tram networks by the 1970s.
Ballarat and Bendigo have retained some trams as heritage vehicles operating on limited trackage. In 2008 and 2009, Bendigo trialled using its heritage trams for regular public transport, but the service was too infrequent to be useful for that.
Portland, Victoria, introduced a tourist tram line in 1996, which uses two replicas of a Melbourne cable tram grip car or dummy, driven by a concealed diesel motor, and two restored trailer cars.
A completely new tram system opened on the Gold Coast on 20 July 2014, with a major extension completed in December 2017. That system is known as the G:link and is the first tram/light rail system in the state of Queensland since Brisbane closed its tram network in 1969.

The construction of light rail in Canberra became the major issue of the 2016 ACT election, with the governing coalition supporting the project and the opposition against it. The government was returned^[146] and Stage 1 of the light rail launched in April 2019.^[147]
The railway into the centre of Newcastle was truncated at Wickham on 25 December 2014,^[148]^[149] and the railway line was replaced by the Newcastle Light Rail line in February 2019.
There are tentative plans for new tram systems in Hobart and on the Sunshine Coast.

New Zealand

New Zealand's tram gauges were not standardised; the 15 systems used no less than five gauges, making swapping of rolling stock from system to system impractical.^[a]

South America

Buenos Aires in Argentina once had one of the most extensive tramway networks in the world with over 857 km (533 mi) of track, but most of it was dismantled during the 1960s in favour of bus transportation. A new line, the PreMetro line E2 system feeding the Line E of the Buenos Aires Underground has been operating since 1987 on the outskirts of Buenos Aires.
In Cuenca, Ecuador, a tram line started operating since March 2019 as the main public transportation system in the city. The L1 of the Cuenca tram is 20.4 km (12.7 mi) long with 20 stops and uses Alstom Citadis (302) trains.
A historic tram line known as the Santa Teresa Tram operates in Rio de Janeiro, Brazil. In 2016, a new tram line started operating in Rio de Janeiro, known as the Light rail transportation system.
The Tranvía del Este in Puerto Madero, Buenos Aires, operated from 2007 to 2012, when it was closed and dismantled.^[150]
Also in the city of Mendoza, in Argentina, a new tramway system is on service since 2012, the Metrotranvía of Mendoza, which will have a route of 12.5 km (7.8 mi) and will link five districts of the Greater Mendoza conurbation.^[151]
In Medellín, Colombia, a tram line began operation on 15 October 2015,^[152]^[153] as a revival of old Ayacucho tram.^[154]
In Santiago, Chile, there are plans for a tramway that will connect the comunes of Las Condes, Lo Barnechea y Vitacura. (tranvía de Las Condes)

Incidents

In January 1864, well-known Anglo-Australian musician and composer Isaac Nathan was hit and killed by a Sydney horse tram when his clothing was caught in the door, whilst he was attempting to alight. Nathan is reputed to be one of the first tram fatalities in the Southern Hemisphere (many sources claim that it was the first such accident).^[155]^[156]
On the morning of 18 August 1901, four masked men, described as "urban bushrangers", held up an eastbound horse tram in Riversdale Road, Melbourne, just past Power Street. For their trouble the men received £2 10/- in fares from driver Thomas Taylor, and £21 19/- from eight passengers. One passenger was injured. The bandits were never caught. Contemporary newspapers hypothesised that the bandits were after a specific commuter who travelled regularly on this particular tram and who was in the habit of carrying large amounts of cash.^[157]^[158]
In the Tottenham Outrage in 1909, two armed robbers hijacked a tram and were chased by the police in another tram.^[159]
On 7 June 1926 Catalan architect Antoni Gaudí was knocked down by a Barcelona tram and subsequently died.^[160]
On 27 February 1930, Paul de Vivie (pen name Vélocio), godfather of the dérailleur was killed by a tram in St Étienne^[161]
It is reputed that in the 1930s a murdered body was dragged out of the River Thames in London.^[162] The body had been stripped of anything that might have identified him. The only clue to the person's identity was a portion of a tram ticket hidden in the lining of his coat. The local police did not recognise the ticket but images in newspapers led to it being identified as a Melbourne tram ticket. Serendipitously, the serial number on the ticket was intact. Victoria Police in Melbourne, acting as agents for the Metropolitan Police in London, contacted the Melbourne & Metropolitan Tramways Board. From the serial number, the M&MTB were able to tell which tram depot had issued the ticket, on what day and on which specific tram, and in which section of a particular route (North Balwyn). Police then interviewed regular commuters and discovered the identity of a man whom, they believed, had recently travelled to London. This led to the arrest and conviction of the murderer. Decades after the event, the M&MTB were still citing the incident in training courses as a reason for tram conductors, etc., to keep proper and efficient records.

Tram modelling

Model trams are popular in HO scale (1:87) and O scale (1:48 in the US and generally 1:43,5 and 1:45 in Europe and Asia). They are typically powered and will accept plastic figures inside. Common manufacturers are Roco and Lima, with many custom models being made as well. The German firm Hödl^[163] and the Austrian Halling^[164] specialise in 1:87 scale.^[165]

In the US, Bachmann Industries is a mass supplier of HO streetcars and kits. Bowser Manufacturing has produced white metal models for over 50 years.^[166] There are many boutique vendors offering limited run epoxy and wood models. At the high end are highly detailed brass models which are usually imported from Japan or Korea and can cost in excess of $500. Many of these run on 16.5 mm (0.65 in) gauge track, which is correct for the representation of 4 ft 8+1⁄2 in (1,435 mm) (standard gauge) in HO scale as in US and Japan, but incorrect in 4 mm (1:76.2) scale, as it represents 4 ft 8+1⁄2 in (1,435 mm). This scale/gauge hybrid is called OO scale. O scale trams are also very popular among tram modellers because the increased size allows for more detail and easier crafting of overhead wiring. In the US these models are usually purchased in epoxy or wood kits and some as brass models. The Saint Petersburg Tram Company^[167] produces highly detailed polyurethane non-powered O Scale models from around the world which can easily be powered by trucks from vendors like Q-Car.^[168]

In the US, one of the best resources for model tram enthusiasts is the East Penn Traction Club of Philadelphia^[169] and Trolleyville a website of the Southern California Traction Club.^[170]

It is thought that the first example of a working model tramcar in the UK built by an amateur for fun was in 1929, when Frank E. Wilson created a replica of London County Council Tramways E class car 444 in 1:16 scale, which he demonstrated at an early Model Engineer Exhibition. Another of his models was London E/1 1800, which was the only tramway exhibit in the Faraday Memorial Exhibition of 1931. Together with likeminded friends, Frank Wilson went on to found the Tramway & Light Railway Society^[171] in 1938, establishing tramway modelling as a hobby.

Etymology and terminology

The English terms tram and tramway are derived from the Scots word tram,^[172] referring respectively to a type of truck (goods wagon or freight railroad car) used in coal mines and the tracks on which they ran. The word tram probably derived from Middle Flemish trame ("beam, handle of a barrow, bar, rung"). The identical word trame with the meaning "crossbeam" is also used in the French language. Etymologists believe that the word tram refers to the wooden beams the railway tracks were initially made of before the railroad pioneers switched to the much more wear-resistant tracks made of iron and, later, steel.^[173] The word Tram-car is attested from 1873.^[174]

Alternatives

Although the terms tram and tramway have been adopted by many languages, they are not used universally in English; North Americans prefer streetcar, trolley, or trolleycar. The term streetcar is first recorded in 1840, and originally referred to horsecars.

The terms streetcar and trolley are often used interchangeably in the United States, with trolley being the preferred term in the eastern US and streetcar in the western US. Streetcar is preferred in English Canada, while tramway is preferred in Quebec. In parts of the United States, internally powered buses made to resemble a streetcar are often referred to as "trolleys". To avoid further confusion with trolley buses, the American Public Transportation Association (APTA) refers to them as "trolley-replica buses". In the United States, the term tram has sometimes been used for rubber-tired trackless trains, which are unrelated to other kinds of trams.

A widely held belief holds the word trolley to derive from the troller (said to derive from the words traveler and roller), a four-wheeled device that was dragged along dual overhead wires by a cable that connected the troller to the top of the car and collected electrical power from the overhead wires;^[175] this portmanteau derivation is, however, most likely folk etymology. "Trolley" and variants refer to the verb troll, meaning "roll" and probably derived from Old French,^[176] and cognate uses of the word were well established for handcarts and horse drayage, as well as for nautical uses.^[177]

The alternative North American term 'trolley' may strictly speaking be considered incorrect, as the term can also be applied to cable cars, or conduit cars that instead draw power from an underground supply. Conventional diesel tourist buses decorated to look like streetcars are sometimes called trolleys in the US (tourist trolley). Furthering confusion, the term tram has instead been applied to open-sided, low-speed segmented vehicles on rubber tires generally used to ferry tourists short distances, for example on the Universal Studios backlot tour and, in many countries, as tourist transport to major destinations. The term may also apply to an aerial ropeway, e.g. the Roosevelt Island Tramway.

The New South Wales government in Australia has decided to use the term "light rail" for their trams.

Trolleybus

Although the use of the term trolley for tram was not adopted in Europe, the term was later associated with the trolleybus, a rubber-tired vehicle running on hard pavement, which draws its power from pairs of overhead wires. These electric buses, which use twin trolley poles, are also called trackless trolleys (particularly in the northeastern US), or sometimes simply trolleys (in the UK, as well as the Pacific Northwest, including Seattle, and Vancouver).

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General and cited references

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The Elephant Will Never Forget (British Transport Films, 1953) showing changeover from conduit to overhead power
Battery tram in Yucatan

[150] New Zealand used the following gauges: 1,435 mm (4 ft 8+1⁄2 in) standard gauge, 1,422 mm (4 ft 8 in), 4 ft (1,219 mm), 1,067 mm (3 ft 6 in), 914 mm (3 ft).

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v t e Public transport
Bus service	Bus driver list Bus rapid transit Charabanc Circle route Cross-city route Express bus Guided bus Intercity bus driver Marshrutka Open top bus Pesero Public light bus Rail replacement bus Share taxi/Taxibus Shuttle bus Transit bus Trolleybus
Rail	Passenger rail terminology glossary Airport rail link Cable car Commuter rail Circle route Cross-city route Elevated railway Funicular Heavy rail Heritage railway Heritage streetcar High-speed rail Higher-speed rail Horsecar Inter-city rail Interurban Light rail Maglev Medium-capacity rail system Monorail Narrow-gauge railway People mover Platform screen doors Railbus Metro/Rapid Transit Rubber-tyred metro Regional rail Street running Suspension railway Tram Tram-train
Vehicles for hire	Auto rickshaw taxi Boda boda Combination bus Cycle rickshaw Demand-responsive transport Microtransit Paratransit Dollar van Dolmuş Gondola Hackney carriage Jeepney Limousine Motorcycle taxi Marshrutka Nanny van Personal rapid transit Pesero Public light bus Pulled rickshaw Share taxi Songthaew Taxi Tuk tuk
Carpooling	Car jockey Flexible carpooling Real-time ridesharing Slugging Vanpool
Ship	Cable ferry Ferry Hovercraft Hydrofoil Ocean liner Vaporetto Water taxi
Cable	Aerial tramway Cable ferry Cable railway Elevator Funicular Gondola lift bicable tricable Inclined elevator
Building transport	Elevator Escalator Moving walkway Inclined elevator
Other transport	Airline Airliner Carsharing Bicycle-sharing Scooter-sharing Elevator Escalator Horse-drawn vehicle Hyperloop Inclined elevator Moving walkway Personal transporter Robotaxi Shweeb Slope car Trackless train Vactrain
Locations	Airport Bus bulb Bus garage Bus lane Bus stand Bus station Bus stop Bus turnout (bus bay) Dry dock Ferry terminal Hangar Harbor Interchange station Kassel kerb Layover Metro station Park and ride Port Queue jump Taxicab stand Train station Tram stop Transit mall Transport hub
Ticketing and fares	Automated fare collection Bus advertising Contract of carriage Dead mileage Exit fare Fare avoidance Fare capping Fare evasion Farebox recovery ratio Free public transport Free travel pass Integrated ticketing Manual fare collection Money train Paid area Penalty fare Proof-of-payment Reduced fare program Smart cards (CIPURSE, Calypso) Ticket machine Transfer Transit pass
Routing	Circle route Cross-city route Network length Non-revenue track Radial route Transport network
Facilities	Checked baggage First class Sleeper Standing passenger Travel class
Scheduling	Bus bunching Clock-face scheduling Headway Night (owl) service On-time performance Public transport timetable Short turn
Politics	Airport security Complete streets Green transport hierarchy Rail subsidies Security Street hierarchy Transit district Transit police Transit-oriented development (TOD) Transportation authority Transportation demand management Transportation planning
Technology and signage	Destination sign Passenger information system Platform display Timetable
Other topics	Boarding Bus rapid transit creep Crush load Destination sign Dwell time Hail and ride Land transport Outline of transport Passenger load factor Public good Request stop Service Sustainable transport Timing point Transit map Transport economics Micromobility
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