Nashua & Lowell Railroad - 1835 - Lowell, Mass. to Nashua
Concord Railroad - 1842 - Nashua to Concord, N.H.
Worcester & Nashua Railroad - 1848 - Worcester, Mass. to Nashua
Peterboro & Shirley Railroad - 1848 - Ayer, Mass. to Greenville, N.H.
Wilton Railroad - 1851 - Nashua to Wilton, N.H.
Nashua, Acton & Boston Railroad - 1873 - Nashua to Acton, Mass.
Nashua & Rochester Railroad - 1874 - Nashua to Rochester, N.H.
Peterborough Railroad - 1874 - Wilton, N.H. to Greenfield, N.H.
Fitchburg Railroad: Brookline & Pepperell Branch - 1892 - Ayer, Mass. to Milford, N.H.
Boston & Maine: Manchester & Milford Branch - 1900 - Goffstown, N.H. to Milford, N.H.
Title image of Nashua Union Station from the collection of Frank R. Mooney.