| Name | Mark | System[1] | From | To | Successor | Notes |
|---|
| Ashuelot Railroad | | B&M | 1844 | 1890 | Connecticut River Railroad | |
| Atlantic and St. Lawrence Railroad | | CN | 1847 | 1960 | Canadian National Railway | |
| Berlin Mills Railway | BMS | | | 1999 | St. Lawrence and Atlantic Railroad | |
| Boston, Concord and Montreal Railroad | | B&M | 1844 | 1890 | Concord and Montreal Railroad | |
| Boston and Lowell Railroad | | B&M | 1880 | 1919 | Boston and Maine Railroad | |
| Boston and Maine Corporation | BM | B&M | 1963 | | | Still exists as a lessor of Pan Am Railways operating subsidiary Springfield Terminal Railway |
| Boston and Maine Railroad | B&M, BM | B&M | 1835 | 1964 | Boston and Maine Corporation | |
| Brookline Railroad | | B&M | 1891 | 1895 | Fitchburg Railroad | |
| Brookline and Milford Railroad | | B&M | 1893 | 1895 | Fitchburg Railroad | |
| Canadian National Railway | CN | CN | 1923 | 1998 | St. Lawrence and Atlantic Railroad | |
| Central Vermont Railroad | | CN | 1873 | 1899 | Central Vermont Railway | |
| Central Vermont Railway | CV | CN | 1899 | 1995 | New England Central Railroad | |
| Cheshire Railroad | | B&M | 1844 | 1890 | Fitchburg Railroad | |
| Claremont and Concord Railway | CLCO | | 1954 | 1988 | Claremont Concord Railroad | |
| Cocheco Railroad | | B&M | 1847 | 1863 | Dover and Winnipiseogee Railroad | |
| Concord Railroad | | B&M | 1835 | 1890 | Concord and Montreal Railroad | |
| Concord and Claremont Railroad | | B&M | 1873 | 1945 | Boston and Maine Railroad | |
| Concord and Claremont Railroad | | B&M | 1848 | 1853 | Merrimack and Connecticut River Railroad | |
| Concord and Montreal Railroad | | B&M | 1890 | 1919 | Boston and Maine Railroad | |
| Concord and Portsmouth Railroad | | B&M | 1855 | 1944 | Boston and Maine Railroad | |
| Connecticut River Railroad | | B&M | 1849 | 1919 | Boston and Maine Railroad | |
| Contoocook River Railroad | | B&M | 1856 | 1873 | Concord and Claremont Railroad | |
| Contoocook Valley Railroad | | B&M | 1848 | 1857 | Contoocook River Railroad | |
| Dover and Winnipiseogee Railroad | | B&M | 1862 | 1892 | Boston and Maine Railroad | |
| Dover and Winnipisiogee Railroad | | B&M | 1839 | 1841 | Boston and Maine Railroad | |
| Eastern Railroad | | B&M | 1839 | 1890 | Boston and Maine Railroad | |
| Eastern Railroad in New Hampshire | | B&M | 1836 | 1899 | Boston and Maine Railroad | |
| Fitchburg Railroad | | B&M | 1847 | 1919 | Boston and Maine Railroad | |
| Franklin and Bristol Railroad | | B&M | 1848 | 1849 | Northern Railroad | |
| Franklin and Tilton Railroad | | B&M | 1889 | 1943 | Boston and Maine Railroad | |
| Glen Junction Transfer Company | | | 1897 | | | |
| Goodwin Railroad | GWIN | | 1976 | 1981 | North Stratford Railroad | |
| Grafton Railroad | | B&M | 1847 | | Northern Railroad | |
| Grand Trunk Railway | GT | CN | 1853 | 1923 | Canadian National Railway | |
| Great Falls and Conway Railroad | | B&M | 1844 | 1865 | Portsmouth, Great Falls and Conway Railroad | |
| Groton and Nashua Railroad | | B&M | 1844 | 1846 | Worcester and Nashua Railroad | |
| Lake Shore Railroad | | B&M | 1883 | 1901 | Concord and Montreal Railroad | |
| Maine Central Railroad | MEC | MEC | 1888 | 2003 | New Hampshire Central Railroad | |
| Manchester and Keene Railroad | | B&M | 1864 | 1881 | Boston and Lowell Railroad/ Concord Railroad | |
| Manchester and Lawrence Railroad | | B&M | 1847 | 1919 | Boston and Maine Railroad | |
| Manchester and North Weare Railroad | | B&M | 1858 | 1899 | Concord and Montreal Railroad | |
| Merrimack and Connecticut River Railroad | | B&M | 1853 | 1873 | Concord and Claremont Railroad | |
| Monadnock Railroad | | B&M | 1848 | 1892 | Fitchburg Railroad | |
| Nashua and Acton Railroad | | B&M | 1907 | 1925 | N/A | |
| Nashua, Acton and Boston Railroad | | B&M | 1872 | 1906 | Nashua and Acton Railroad | |
| Nashua and Epping Railroad | | B&M | 1848 | 1868 | Nashua and Rochester Railroad | |
| Nashua and Lowell Railroad | | B&M | 1835 | 1944 | Boston and Maine Railroad | |
| Nashua and Rochester Railroad | | B&M | 1868 | 1883 | Worcester, Nashua and Rochester Railroad | |
| New Boston Railroad | | B&M | 1891 | 1934 | N/A | |
| New Hampshire Central Railroad | | B&M | 1848 | 1853 | Merrimack and Connecticut River Railroad | |
| New Hampshire and Vermont Railroad | NHVT | | 1989 | 2000 | New Hampshire Central Railroad | |
| North Stratford Railroad | NSRC | | 1977 | 1989 | New Hampshire Central Railroad | |
| Northern Railroad | | B&M | 1844 | | | |
| Pemigewasset Valley Railroad | | B&M | 1874 | 1947 | Boston and Maine Railroad | |
| Peterborough Railroad | | B&M | 1866 | 1944 | Boston and Maine Railroad | |
| Peterborough and Hillsborough Railroad | | B&M | 1869 | 1945 | Boston and Maine Railroad | |
| Peterborough and Shirley Railroad | | B&M | 1846 | 1860 | Fitchburg Railroad | |
| Portland and Ogdensburg Railroad | | MEC | 1869 | 1887 | Portland and Ogdensburg Railway | |
| Portland and Ogdensburg Railway | | MEC | 1886 | 1943 | Maine Central Railroad | |
| Portland, White Mountains and Ogdensburg Railroad | | MEC | 1867 | 1869 | Portland and Ogdensburg Railroad | |
| Portsmouth and Concord Railroad | | B&M | 1845 | 1857 | Concord and Portsmouth Railroad | |
| Portsmouth and Dover Railroad | | B&M | 1866 | 1900 | Boston and Maine Railroad | |
| Portsmouth, Great Falls and Conway Railroad | | B&M | 1865 | 1890 | Boston and Maine Railroad | |
| Portsmouth, New Market and Concord Railroad | | B&M | 1845 | 1845 | Portsmouth and Concord Railroad | |
| Portsmouth, New Market and Exeter Railroad | | B&M | 1845 | 1845 | Portsmouth and Concord Railroad | |
| Portland and Rochester Railroad | | B&M | 1866 | 1900 | Boston and Maine Railroad | |
| Profile and Franconia Notch Railroad | | B&M | 1878 | 1901 | Concord and Montreal Railroad | |
| Sugar River Railroad | | B&M | 1866 | 1873 | Concord and Claremont Railroad | |
| Sullivan Railroad | | B&M | 1846 | 1866 | Sullivan County Railroad | |
| Sullivan County Railroad | SC | B&M | 1866 | 1949 | Boston and Maine Railroad | |
| Suncook Valley Railroad | | B&M | 1870 | 1952 | N/A | Became independent from B&M in 1924. |
| Suncook Valley Extension Railroad | | B&M | 1889 | 1947 | Concord and Montreal Railroad | Acquired by Suncook Valley Railroad in 1925. |
| Tilton and Belmont Railroad | | B&M | 1883 | 1901 | Concord and Montreal Railroad | |
| Twin State Railroad | TSRD | | 1984 | 1999 | New Hampshire Central Railroad | |
| Upper Coos Railroad | | MEC | 1883 | 1982 | Maine Central Railroad | |
| Vermont Central Railroad | | CN | 1871 | 1873 | Central Vermont Railroad | |
| West Amesbury Branch Railroad | | B&M | 1868 | 1893 | Boston and Maine Railroad | |
| White Mountains Railroad | | B&M | 1848 | 1873 | Boston, Concord and Montreal Railroad | |
| Whitefield and Jefferson Railroad | | B&M | 1878 | 1904 | Concord and Montreal Railroad | |
| Wilton Railroad | | B&M | 1844 | 1944 | Boston and Maine Railroad | |
| Wolfeboro Railroad | WLFB | | 1975 | 1976 | Goodwin Railroad | |
| Wolfeborough Railroad | | B&M | 1862 | 1892 | Boston and Maine Railroad | |
| Worcester and Nashua Railroad | | B&M | 1845 | 1883 | Worcester, Nashua and Rochester Railroad | |
| Worcester, Nashua and Rochester Railroad | | B&M | 1883 | 1911 | Boston and Maine Railroad | | |
