The GLX is primarily located in Somerville, northwest of downtown Boston, with its northernmost portion in Medford and its southernmost portion in the East Cambridge section of Cambridge. The Red Bridge viaduct, which connects the two branches with the viaduct to Lechmere and to the maintenance facility The new Lechmere station and Union Square Branch opened on March 21, 2022, with the Medford Branch expected to open in November 2022. Construction began in 2018, with the old Lechmere station closed in May 2020. The main $1.08 billion design-build contract was issued in November 2017, with several optional items like platform canopies and a larger vehicle maintenance facility included. A revised plan, with more modest stations and other value engineering, was submitted in 2016 and approved in 2017. In 2015, with projected costs increased to $3.3 billion, the project was placed on hold. The federal government committed $996 million of the $2.2 billion cost in 2014. A groundbreaking was held in 2012, with several early construction elements over the next two years. Planning began in 2006 with a projected completion date of 2014 this was delayed to 2015, then to 2018. Despite appearing in other regional plans throughout the 20th century, the state did not commit to the project until 1990. A new vehicle maintenance facility and storage yard is located in the Inner Belt District.Īn extension of service beyond Lechmere was considered as early as 1922, with the first formal proposal in 1926. The Medford Branch follows the Lowell Line right-of-way to Medford/Tufts station with four intermediate stations. The two branches split north of Lechmere, with the Union Square Branch following the MBTA Commuter Rail Fitchburg Line right of way to Union Square station in Somerville. The project begins at the north end of the Lechmere Viaduct, where the former ground-level Lechmere station was replaced by an elevated station on an extended viaduct. Total ridership on the 4.3-mile (6.9 km) extension is estimated to reach 45,000 one-way trips per day in 2030.
The project is opening in two phases in 2022 at a total cost of $2.28 billion. The Green Line Extension ( GLX) is a construction project to extend the light rail Massachusetts Bay Transportation Authority (MBTA) Green Line northwest into Somerville and Medford, two inner suburbs of Boston, Massachusetts.
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