US-based transportation design firm STV has been appointed as the lead designer for the Massachusetts Bay Transportation Authority’s (MBTA) $1.3bn Green Line Light Rail Extension (GLX).
STV will be part of the design-build team led by GLX Constructors, a joint venture comprising Fluor, Middlesex, Herzog Contracting and Balfour Beatty.
The 4.3-mile extension will link the Massachusetts communities of Cambridge, Somerville and Medford to downtown Boston.
Construction is expected to begin later in 2018, with revenue service beginning in 2021.
The project includes the design and construction of a vehicle maintenance facility, administration building, a viaduct, six new stations, one relocated station, six bridges and a community path.
STV vice president and Boston office manager Mark Pelletier said: “The three communities where the Green Line Extension project is being constructed have been engaged in this process for nearly 20 years.
“They are knowledgeable, passionate and excited to have public transportation being made available to them. We look forward to working with them, the MBTA, and the Fluor Middlesex/Herzog/Balfour Beatty team in making this project a reality.”
The MBTA expects several benefits from the project, including reduction of 26,000 regional daily vehicle miles travelled, which will improve air quality and reduce automobile congestion.
The seven new GLX stations will include amenities that will meet or exceed the standards of the Americans with Disabilities Act.
Daily ridership at the seven stations is expected to touch 45,000 by 2030.
All GLX operations will take place within the existing railroad right-of-way (ROW), the 3.4-mile Lowell Line and 0.9-mile Fitchburg Line, which will minimise the need to purchase additional ROW.
STV’s earlier projects for the MBTA included the North Station Transportation Improvement project, where the elevated section of the Green Line’s viaduct was relocated into a tunnel section.
In the mid-2000s, STV was appointed as the lead designer for the Greenbush Commuter Rail Restoration project, which was the largest design-build project ever undertaken by the MBTA.