Track 61

Track 61 is an industrial rail terminal track in South Boston, Massachusetts, also known as the Boston Terminal Running Track. Track 61 is the last remnant of the vast rail yards that once covered much of the South Boston waterfront. Track 61 legally begins at Summer Street, while the line from Bay Junction to Summer Street is the Boston Terminal Running Track and Terminal Yard. However, the names are frequently used interchangeably.

Part of what is now Track 61 was constructed in 1855 and became part of the New York and New England Railroad. Other sections were constructed from 1880 to 1920 as South Boston became a freight center. During the second half of the 20th century use of the line declined, and part of it is currently out of service. While trains do not currently operate along the line, one section was rebuilt in 2005. Revival of freight service and passenger services using the track was proposed by the state in the 2010s, but not funded. From 2019 to 2023, a section of the track will be used for acceptance testing of new Red Line subway cars.

The Boston and New York Central Railroad opened its Dorchester Branch from Dedham to Boston on January 1, 1855, begun in 1850 by the Midland Railroad as an extension of the existing Norfolk County Railroad. The terminal station was located on Summer Street near the modern location of South Station. Trains crossed the Old Colony Railroad at South Bay Junction, then ran parallel to A Street before crossing the Fort Point Channel at Summer Street. Past West 1st Street, the line ran on a trestle through shallow water. An intermediate station was located in South Boston at West 2nd Street; this was separate from the Old Colony's South Boston station at West 4th Street. After several monetary failures and a year-long injunction due to grade crossings, the line was reorganized several times, ending as the Boston, Hartford and Erie Railroad in 1863 and finally part of the New York & New England Railroad in 1873.

A spur was built in the 1870s to the new Fan Pier, constructed by erecting a seawall to hold in fill. In November 1880, a second track opened from Boston to Walpole. The tracks through South Boston were depressed for grade separation; in some places, they were as far as 5 feet below mean sea level to allow for the construction of 12 bridges overhead.

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