Green Line Extension Project (GLX)

The Green Line Extension (GLX) project extends MBTA Green Line service north of Lechmere Station and into the communities of Somerville, Cambridge, and Medford.

The project involves construction of 6 new Green Line stations along 2 branches: the Medford Branch which opened for passenger service on December 12, 2022, and Union Square Branch which began passenger service on March 21, 2022. In addition to the new stations, Lechmere Station was relocated and reconstructed.

The project will significantly reduce vehicle trips and related air emissions while increasing access to fast and reliable public transit service in historically underserved areas. The project is expected to support increased ridership of more than 50,000 passenger trips per day once completed.

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Contact Information


200 Inner Belt Road, Somerville, MA 02143


Mon-Fri (6:30am-8pm) and Sat & Sun (8am-4pm)

Mon-Fri (6:30am-8pm) and Sat & Sun (8am-4pm)

Image credits:  MassDOT

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