The Boston and New York Air-Line Railroad was a railroad in Connecticut. Envisioned as a direct route between New Haven and Boston, it was hampered by difficult terrain in eastern Connecticut and did not find much success. The New York, New Haven and Hartford Railroad leased the company in 1882. The tracks between Portland, Connecticut and Willimantic, Connecticut were abandoned in 1965, while the remainder of the line is operated by the Providence and Worcester Railroad.

The Providence and Worcester Railroad is a Class II railroad operating 612 miles (985 km) of tracks in Rhode Island, Massachusetts, and Connecticut, as well as New York via trackage rights. The company was founded in 1844 to build a railroad between Providence, Rhode Island, and Worcester, Massachusetts, and ran its first trains in 1847. A successful railroad, the P&W subsequently expanded with a branch to East Providence, Rhode Island, and for a time leased two small Massachusetts railroads. Originally a single track, its busy mainline was double-tracked after a fatal 1853 collision in Valley Falls, Rhode Island.