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Green Line Extension (GLX)

A Green Line train approaches Lechmere at dusk (March 2022)

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
  • Construction schedule:
    • Union Branch: Opened March 21, 2022
    • Medford Branch: Service projected to begin December 12, 2022
  • 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.

Building a Better T

As part of our $9.6 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

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 six new additional T stations
  • A new vehicle storage and maintenance facility

View GLX stops on system map

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

How to Pay for Your Fare

At Lechmere and Union Square stations, all riders will need to validate their CharlieCards or tappable CharlieTickets at a fare vending machine prior to boarding, or use the fare box at the front of the train. Please note that old, insertable CharlieTickets can only be validated at onboard fare boxes.

Learn more about how to validate your fare

What to Expect During Construction

Two test trollies arrive and depart the new Union Square station. The station was under construction at the time the trollies were tested, so traffic cones and a temporary chain link fence sit on the platform between the two trains.
Test trollies arrive at and depart from Union Square station prior to its opening (January 2022)

green line Green Line Service Changes

After the Medford Branch opens:

  • E Branch trains will terminate at Medford/Tufts
  • D Branch trains will terminate at Union Square

View Green Line service alerts for current service information

commuter rail Commuter Rail Service Changes

Commuter Rail service may shut down periodically along various portions of the Lowell Line to support this work. Shuttles will replace trains during these times.

See service alerts for the Lowell Line

Bridge Closures

LocationStatusSchedule
LocationWashington Street Bridge/UnderpassStatusOpenScheduleReopened May 31, 2020.
LocationBroadway BridgeStatusOpenScheduleReopened June 6, 2020.
LocationMedford Street BridgeStatusOpenScheduleReopened July 1, 2022.
LocationSchool Street BridgeStatusClosedScheduleWork is ongoing. Expected to reopen November 2022.

Learn more about bridge closures and detours

Past Events

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Contact Us

For questions and comments related to the Green Line Extension (GLX), please contact the GLX Project Team at info@glxinfo.com or 617-222-3200.

Recent Updates

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Related Projects

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Building a Better T

As part of our $9.6 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

View all projects