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Green Line Extension (GLX)

Green Line train pulling into the Science Park/West End Station

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.

  • Contract awarded: November 2017
  • Projected completion: December 2021
  • Budget: $2.3 billion
  • Status: Construction

GLX will provide service in areas that historically did not have access to fast and reliable public transit. By supporting an increased ridership of more than 50,000 trips per day, this project will significantly reduce vehicle emissions on the road.

Diversions

Building a Better T

As part of our $8 billion, 5-year capital investment plan, we're renovating stations, modernizing fare collection systems, upgrading services for our buses, subways, and ferries, and improving the accessibility of the entire system.

Learn more

What to Expect During Construction

A crane lowers a large, green, steel girder beam into place on the Washington Street Bridge/Underpass in Somerville. They are the first steel bridge girders to be installed as part of GLX.
The first steel Washington Street Bridge girders are installed in August 2019 in Somerville.

During construction, 3 major bridges in Somerville are closed:

  • Broadway Bridge: Routes 80 and 89 are detoured (as of March 22, 2019)
  • Washington Street Bridge: Routes 86, 91, and CT2 are detoured (as of April 8, 2019)
  • Medford Street Bridge: The bridge closed on May 17, 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 and reconstruction of Lechmere Station in Cambridge, plus 6 new additional T stations
  • A new vehicle storage and maintenance facility

Rider 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

Past Events

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Contact Information

For all queries and comments related to Green Line Extension (GLX), please contact the GLX Project Team at info@glxinfo.com or 855-459-4636.

Recent Updates

View all project updates

Related Projects

Side view of new Green Line car at Riverside (July 2018)

This project is one of many we're working on to ensure twice as many passengers have access to a safer, more comfortable, and more reliable Green Line by 2030.

Learn more about the Green Line Transformation

Diversions

Building a Better T

As part of our $8 billion, 5-year capital investment plan, we're renovating stations, modernizing fare collection systems, upgrading services for our buses, subways, and ferries, and improving the accessibility of the entire system.

Learn more

Recent Updates

View all project updates

Related Projects

Side view of new Green Line car at Riverside (July 2018)

This project is one of many we're working on to ensure twice as many passengers have access to a safer, more comfortable, and more reliable Green Line by 2030.

Learn more about the Green Line Transformation