List of New York, New Haven and Hartford Railroad precursors

These railroads were bought, leased, or in other ways had their track come under ownership or lease by the New York, New Haven and Hartford Railroad.^[1] The NYNH&H was formed in 1872 as a merge of the New York and New Haven Railroad and Hartford and New Haven Railroad.

Old Colony Railroad 1893

Boston and Providence Railroad 1888
- Stoughton Branch Railroad 1872
Boston, Clinton, Fitchburg and New Bedford Railroad 1879
- Boston, Clinton and Fitchburg Railroad 1876
  - Agricultural Branch Railroad 1869
  - Fitchburg and Worcester Railroad 1869
  - Framingham and Lowell Railroad 1871
  - Mansfield and Framingham Railroad 1870
  - New Bedford Railroad 1875
    - New Bedford and Taunton Railroad 1874
      - Fairhaven Branch Railroad 1868
    - Taunton Branch Railroad 1873
Cape Cod Railroad 1872
- Cape Cod Branch Railroad 1868
- Cape Cod Central Railroad 1868
Duxbury and Cohasset Railroad 1878
Fall River, Warren and Providence Railroad 1892
Granite Railroad 1870
Hanover Branch of Massachusetts Railroad 1887
Middleborough and Taunton Railroad 1874
Nantasket Beach Railroad 1888
Old Colony and Newport Railroad 1872
- Dighton and Somerset Railroad 1864
- Easton Branch Railroad 1866
- Newport and Fall River Railroad 1863
- Old Colony and Fall River Railroad 1864
  - Fall River Railroad 1854
  - Middleborough Railroad 1895
  - Old Colony Railway 1854
    - Dorchester and Milton Railroad 1847
  - Randolph and Bridgewater Railroad 1845
Plymouth and Middleborough Railroad 1892
Providence, Warren and Bristol Railroad 1891
South Shore Railroad 1876

Berkshire Railroad 1843
Danbury and Norwalk Railroad 1886
Danbury Terminal Railroad 1997
New Haven and Derby Railroad 1889
New York, Housatonic and Northern Railroad 1876
Shepaug, Litchfield and Northern Railroad 1891
- Shepaug Railroad 1887
- Shepaug Valley Railroad 1873
Stockbridge and Pittsfield Railroad 1874
West Stockbridge Railroad 1843

Newburgh, Dutchess and Connecticut Railroad 1905
- Clove Branch Railroad 1896
- Dutchess and Columbia Railway 1877
  - New York, Boston and Montreal Railway 1874
    - Harlem Extension Railroad 1873
      - Lebanon Springs Railroad 1870
    - New York, Boston and Northern Railway 1873
      - Dutchess and Columbia Railroad 1872
Philadelphia, Reading and New England Railroad 1899
- Central New England and Western Railroad 1892
  - Hartford and Connecticut Western Railroad 1890
    - Connecticut Western Railroad 1881
    - Rhinebeck and Connecticut Railroad 1882
- Dutchess County Railroad 1892
Poughkeepsie and Eastern Railroad 1907
- New York and Massachusetts Railroad 1893
  - Poughkeepsie, Hartford and Boston Railroad 1887
    - Poughkeepsie and Eastern Railway 1875

New Haven and Northampton Railroad 1849
- Hampshire and Hampden Railroad 1862
- Holyoke and Westfield Railroad 1870
Shore Line Railway 1870
- New Haven, New London and Stonington Railroad 1868
  - New Haven and New London Railroad 1857
  - New London and Stonington Railroad 1857
  - New York and New London Railroad 1857

^ RAILROADS IN NORTH AMERICA; Some Historical Facts and An Introduction to an Electronic Database of North American Railroads and Their Evolution by M. C. Hallberg (April 24, 2006)[1]