Massachusetts Bay Transportation Authority (MBTA) Massachusetts Department of Transportation
Green Line Extension Green Line Extension
Project Overview - Details


The Massachusetts Department of Transportation (MassDOT) and the Massachusetts Bay Transportation Authority (MBTA) are proposing to extend the MBTA Green Line from a relocated Lechmere Station in East Cambridge to Union Square in Somerville and College Avenue in Medford. While proposals to extend public transit service north from Lechmere date back many decades, the current phase of planning began in 2005 with the completion of the MBTA's Beyond Lechmere Northwest Corridor Study Major Investment Study/Alternatives Analysis. Planning has been underway since.

Bringing MBTA light rail service to this corridor will greatly improve local and regional mobility, address longstanding transportation inequities, result in fewer automobiles on local roads, and help to combat greenhouse gas emissions and other components of air pollution. The Green Line Extension will also support municipal plans for sustainable growth and urban redevelopment and provide residents of environmental justice communities with faster rides to jobs and other destinations.

The proposed service consists of two distinct branches: a "mainline" branch which will operate within the existing right-of-way for the MBTA Lowell Line, beginning at a relocated Lechmere Station in Cambridge and traveling north to Medford; and a branch line operating within the existing right-of-way for the MBTA Fitchburg Line to Union Square in Somerville. There will be seven new stations constructed as part of the project, including the relocated Lechmere Station. A vehicle storage and maintenance facility will also be constructed. In addition to the infrastructure needs of the project, MassDOT will prepare final engineering for the proposed extension of the Somerville Community Path between Lowell Street and Inner Belt Road in Somerville. Once completed, trains will operate every five to six minutes in the peak periods, providing fast and efficient service to downtown Boston.

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