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Green Line Extension (GLX)

Updated on March 28, 2019

Green Line train pulls into Science Park/West End Station, with sunlight in the background.

About the Project

Timeline: 2014 – 2021
Status: Construction

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.

During construction, 3 major bridges in Somerville will be closed, starting in March 2019:

  • Broadway Bridge: Routes 80 and 89 will be detoured long-term, starting March 22, 2019
  • Washington Street Bridge: Routes 86, 91, and CT2 will be detoured long-term, starting April 8, 2019
  • Medford Street Bridge: Construction is scheduled to start in summer 2019

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

Contact Information

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

GLX Project Team