Green Line D branch
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| Green Line D branch | |
|---|---|
 | |
| Name | D branch |
| Type | Rapid transit |
| System | MBTA |
| Locale | Greater Boston |
| Start | Riverside |
| End | Government Center |
| Stations | 25 |
| Open | 1959 |
| Owner | Massachusetts Bay Transportation Authority |
| Operator | Massachusetts Bay Transportation Authority |
| Character | Grade-separated |
| Stock | Type 7 light rail vehicles |
| Linelength | 9.7 mi |
Green Line D branch. It is a light rail service of the Massachusetts Bay Transportation Authority, operating as part of the Green Line system. The branch runs from Government Center in downtown Boston to Riverside in the suburb of Newton, utilizing a former Boston and Albany Railroad right-of-way. As the longest and only fully grade-separated branch of the Green Line, it provides a critical transit link between Brookline, Newton, and the Boston core.
History
The right-of-way was originally developed by the Boston and Albany Railroad in the 19th century for its Highland Branch commuter rail service. Following the decline of commuter rail, the Massachusetts Bay Transportation Authority converted the line to light rail, with service commencing in 1959. This conversion was part of a broader post-war strategy to replace streetcar lines with more efficient rapid transit in key corridors. The line was integrated into the newly color-coded Green Line system in the 1960s. Subsequent decades saw station upgrades and accessibility improvements under mandates from the Americans with Disabilities Act.
Route and stations
The branch travels approximately 9.7 miles from its downtown terminus at Government Center, sharing the Central Subway tunnel with other Green Line services before emerging into the Southwest Corridor near Northeastern University. It diverges onto its own dedicated right-of-way after Fenway station, following the former Boston and Albany Railroad corridor. Key stations include Longwood, Brookline Village, Beaconsfield, and Newton Centre. The line terminates at the Riverside station, which features a large park and ride facility adjacent to the Charles River.
Rolling stock
Service is operated using Type 7 light rail vehicles, built by Kinki Sharyo and introduced in the late 1980s. These articulated vehicles are necessary to navigate the tight curves of the Central Subway. The Type 7 fleet is maintained at the Riverside maintenance facility. These cars are gradually being supplemented or replaced by newer Type 9 and Type 10 vehicles as part of the MBTA's system-wide fleet modernization program.
Service and operations
The D branch operates with higher average speeds than other Green Line branches due to its exclusive right-of-way and lack of street-running segments. Headways vary from 6-12 minutes during peak periods. The line interfaces with the MBTA Commuter Rail at several points, including Lansdowne station near Fenway Park and Riverside. It provides essential service to major employment centers like the Longwood Medical and Academic Area and Boston University. Operational control is managed from the MBTA's Operations Control Center.
Future plans
Planned improvements include the full implementation of positive train control-like safety systems as part of the MBTA's Green Line Transformation program. There are ongoing studies regarding potential extension of service further into Newton or Needham. Station modernization projects, focused on accessibility and passenger amenities, are planned for several stops including Newton Centre and Brookline Hills. These efforts align with regional goals outlined in the Metropolitan Area Planning Council's transportation plans.