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Green Line Extension (GLX)

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

The Green Line Extension (GLX) extends 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: Opened December 12, 2022
  • Budget: $2.3 billion
  • Status: Complete

GLX provides 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: Union Square, East Somerville, Gilman Square, Magoun Square, Ball Square, and Medford/Tufts.
  • A new vehicle storage and maintenance facility

On December 12, Green Line service will change as follows:

View Green Line 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

Riders will need to validate their fare at all GLX stations. Riders should tap their CharlieCards or tappable CharlieTickets at the fare vending machines prior to boarding.

These upgraded fare vending machines are at the following stations:

Note: Old, insertable CharlieTickets can only be validated at onboard fare boxes.

Bridge Updates

As part of this project, we updated these bridges:

LocationStatusSchedule
LocationWashington Street Bridge/UnderpassStatusOpenScheduleReopened May 31, 2020.
LocationBroadway BridgeStatusOpenScheduleReopened June 6, 2020.
LocationMedford Street BridgeStatusOpenScheduleReopened July 1, 2022.
LocationSchool Street BridgeStatusClosedScheduleReopened December 9, 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