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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 view of the Lechmere Viaduct stretching north from Boston, with framing for the relocated Lechmere Station on the right
A view of the Lechmere Viaduct stretching north from Boston, with framing for the relocated Lechmere Station on the right

green line Green Line Service Changes

Starting on May 24, 2020, Green Line service will shut down at Lechmere and Science Park stations for approximately one year while crews work on the Lechmere Viaduct Rehabilitation in conjunction with Green Line Extension work.

During this time, dedicated inbound and outbound bus lanes along Charles River Dam Road will connect Lechmere and North Station, providing continued service for 14,000 Green Line riders.

See service alerts for Green Line E branch

commuter rail Commuter Rail Service Changes

Through November 2020, weekend Commuter Rail service will shut down along various portions of the Lowell Line to support this work. Shuttles will replace trains during this time.

See service alerts for the Lowell Line

Bridge Closures

Work is being done near major bridges in Somerville. Impacts include bridge closures and some detours:

LocationStatusSchedule
LocationWashington Street Bridge/UnderpassStatusOpenScheduleReopened May 31, 2020.
LocationBroadway BridgeStatusOpenScheduleReopened June 6, 2020.
LocationMedford Street BridgeStatusClosedScheduleWork is ongoing. Expected to reopen in spring 2021.
LocationSchool Street BridgeStatusClosedScheduleWork is ongoing. Expected to reopen in spring 2021.

Learn more about bridge closures and detours

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

View all events

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