Boston Green Line Extension Map: Web the green line extension (glx) will extend the northern end of the green line from lechmere to union square in somerville. Web green line extension update. The green line extension (glx) project extends the existing mbta green line north from.

Boston Green Line Extension Map

Web for questions and comments related to the green line extension (glx), please contact the glx project team at. Route description schematic map of. Web the green line extension (glx) will extend the northern end of the green line from lechmere to union square in somerville.