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Green Line Extension (GLX)

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

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.

  • Contract awarded: November 2017
  • Projected completion: Fall 2021
  • Budget: $2,118,600,000
  • Status: 22% construction complete

As part of the Green Line Transformation (GLT), this project meets the following goals:

  • Addressing demand: Increase capacity and service frequency with 6 new subway stops in Cambridge, Medford, and Somerville
  • Service delivery: Improve on-time performance and reduce speed delays
  • Accessibility: Remove barriers to access at all-new, fully accessible stations

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 will be closed:

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

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
  • 6 all-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

Service Alerts

Check Green Line alerts

Photos

View photos from MassDOT

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.

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

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