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Green Line Extension (GLX) Union Square Branch Opens March 21

Updated on March 18, 2022

The Union Square Branch of the Green Line Extension (GLX) will open for service on March 21, 2022. The new branch will extend the northern end of the Green Line from Lechmere in East Cambridge to Union Square in Somerville.

Green Line Service Changes

Beginning on March 21, Green Line service will change as follows:

  • B and C Branch trains will terminate at Government Center
  • D Branch trains will terminate at North Station
  • E Branch trains will terminate at Union Square

Union Square station will serve the Green Line’s E Branch as of opening day, but will switch to Green Line D Branch service later this year when testing begins on the new Medford Branch.

View Green Line maps and schedules

View Green Line service alerts for current service information

View GLX stops on an MBTA system map

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

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

Contact Us

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

Related Projects

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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

View all projects