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Green Line Extension (GLX)

Updated on July 20, 2018

Green Line train pulls up to an outdoor platform.

About the Project

Timeline: 2014-2021
Status: Design

The Green Line Extension (GLX) will extend the northern end of the Green Line from Lechmere to Union Square in Somerville and College Avenue in Medford. 

Project Features

  • A new Green Line branch on existing Lowell Commuter Rail tracks, from Lechmere to Medford
  • A new Green Line branch on existing Fitchburg Commuter Rail tracks, from Lechmere to Union Square in Somerville
  • The relocation of Lechmere Station in Cambridge
  • 7 new T stations
  • A new vehicle storage and maintenance facility

Commuter Benefits

  • Create additional transportation routes in the Medford and Somerville neighborhoods
  • Reduce the number of vehicles on local roads to improve traffic concerns
  • Support municipal plans for sustainability and urban redevelopment
  • Reduce maintenance costs and service impacts for the foreseeable future

Service Alerts

Check Green Line alerts

Featured Photos


June 27, 2018

GLX Groundbreaking

On June 25, 2018, GLX construction broke ground.

May 31, 2018

Fitchburg Line Modified Service

Due to Green Line Extension construction, there will be no Commuter Rail service between Porter and North Station on the Fitchburg Line on weekends May 5 to June 3, 2018.

March 19, 2018

GLX Construction Activities (Through July 2018)

GLX Constructors, the design-build entity for the MBTA Green Line Extension Project, began pre-construction activities in January 2018, in advance of construction work that is scheduled for the late spring/summer of 2018.

Contact Information

For all queries and comments related to Green Line Extension (GLX), please contact:

GLX Project Team