The Fairmount Line or Dorchester Branch is a line of the MBTA Commuter Rail system in Boston, Massachusetts, USA. Except for a short portion in Milton, it lies entirely within Boston, running southwest from South Station through the neighborhoods of Dorchester, Mattapan and Hyde Park. Weekend service began on November 29, 2014. Most trains reverse direction at the south end at Readville, but some Franklin/Foxboro Line trains use the Fairmount Line rather than the Northeast Corridor.
An inbound train at Talbot Avenue station in July 2019
Morton Street station as built in 1979
PARK interlocking, just north of Talbot Ave station, was added in 2007–2008
Talbot Ave was the first new station to open under the Fairmount line improvements project
The MBTA Commuter Rail system serves as the commuter rail arm of the Massachusetts Bay Transportation Authority's (MBTA's) transportation coverage of Greater Boston in the United States. Trains run over 394 mi (634 km) of track to 134 stations. It is operated under contract by Keolis, which took over operations on July 1, 2014, from the Massachusetts Bay Commuter Railroad Company (MBCR).
An outbound Lowell Line train at Anderson/Woburn in 2023
A train at North Scituate – a typical suburban station with a full-length high-level platform
A CSX freight train at Readville station
Commuter Rail tickets in the form of CharlieTickets purchased at fare vending machines and ticket booths (left) and paper tickets purchased on-board (right).
