The Dorchester and Milton Branch Railroad was a railroad in Massachusetts. It was incorporated in 1846 as a branch off the Old Colony Railroad main line from Boston to Plymouth. The 3.3 mile road was completed on December 1, 1847 from Neponset Village in Dorchester, Massachusetts through the town of Milton to the village of Mattapan.
The line was was leased to the Old Colony Railroad from January 1, 1848 to January 1, 1856, and operated under contract by the Old Colony from 1856 to 1863 when it was merged into the Old Colony and Fall River Railroad Company.[1]
In 1893, it became part of the New York, New Haven and Hartford Railroad as part of the lease of the entire Old Colony Railroad network.
The original portion of line east of Granite Avenue in Dorchester has been converted into a multi-use rail trail as part of the Neponset River Greenway.[2] The western part of the line is currently used by the MBTA for the Ashmont–Mattapan High Speed Line.