The Portland, Saco and Portsmouth Railroad (PS&P) was a railroad in Maine that ran from Portland via Saco to South Berwick.

The Manchester and Lawrence was chartered in 1847 and opened in November 1849. It leased the newly built Methuen Branch from the Boston and Maine Railroad which opened in August 1849 and ran from South Lawrence through Methuen to the state line where the two lines met.

The Fitchburg Railroad is a former railroad company, which built a railroad line across northern Massachusetts, United States, leading to and through the Hoosac Tunnel. The Fitchburg was leased to the Boston and Maine Railroad in 1900. 

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The Providence and Worcester Railroad (P&W; reporting mark PW) is a Class II railroad operating 612 miles (985 km) of tracks in Rhode Island, Massachusetts, and Connecticut, as well as 

The New York and New England Railroad (NY&NE) was a railroad connecting southern New York State with Hartford, Connecticut; Providence, Rhode Island; and Boston, Massachusetts. It operated under that name from 1873 to 1893.

The Boston and Maine Railroad was chartered in New Hampshire on June 27, 1835, and the Maine, New Hampshire and Massachusetts Railroad was incorporated March 12, 1839, in Maine, both companies continuing the proposed line to South Berwick, Maine. The railroad opened in 1840 to Exeter, New Hampshire, and on January 1, 1842, the two companies merged with the Boston and Portland to form a new Boston and Maine Railroad.

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The Connecticut River Railroad was a railroad located along the Connecticut River in western Massachusetts, formed in 1845 from the merger of two unfinished railroads. Its main line from Springfield to East Northfield, Massachusetts, opened in stages between 1845 and 1849.

The Fitchburg and Worcester Railroad was a railroad in Massachusetts. It was incorporated in 1840 to provide a rail connection between Fitchburg and Worcester.