Indigo Line

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Indigo Line
TypeCommuter Rail
SystemMassachusetts Bay Transportation Authority
StatusCommuter rail line (On Hold)
LocaleEastern Massachusetts
Opened2024 (Proposed)
Track gauge4 ft 8 12 in (1,435 mm) standard gauge

The Indigo Line is a proposed service of the Massachusetts Bay Transportation Authority that could incorporate parts of the former Grand Junction Railroad, the Seaport District's Track 61, a spur to the Riverside station and other MBTA Commuter Rail lines. Although it has been talked about for years, mostly in relation to the Fairmount Line, the line was formally proposed in 2014 when the MBTA released its five-year capital plan. According to the "MBTA Vision for 2024" proposal, the line would operate diesel multiple units for its rolling stock and would be fully operational in that year.[1][2]


The term "Indigo Line" dates back to the creation of the Fairmount Indigo Planning Initiative, which proposed transforming the Fairmount Line into a rapid transit commuter rail hybrid line.[3] Most of the infill stations proposed by the initiative have been built, with one more planned; however, the line still uses conventional commuter rail equipment.

Indigo lines under consideration[edit]

The Nippon Sharyo DMU is proposed for Indigo service

The MBTA Vision for 2024 map shows six possible lines for Indigo DMU service:

The Sonoma–Marin Area Rail Transit purchase of Nippon Sharyo DMU trains in 2010 included an option for 18 cars to be provided to the MBTA for the Indigo Line service.[4]

The Indigo Line has since been indefinitely postponed.[5]


  1. ^ Annear, Steve (January 9, 2014). "Take A Ride On The MBTA's 'New Indigo Line' In 2024". Boston Magazine. Retrieved March 11, 2014.
  2. ^ Quinn, Garrett (January 10, 2014). "MassDOT five-year plan includes introduction of Indigo Line, extension of Green Line". Springfield Republican. Retrieved March 11, 2014.
  3. ^ "HISTORY OF THE FAIRMOUNT LINE". Retrieved March 26, 2014.
  4. ^ "WES Ridership and Fleet Requirements" (PDF). April 9, 2014. Retrieved October 1, 2014.
  5. ^

External links[edit]