The Massachusetts Bay Transportation Authority (MBTA) has retained the joint venture of White Skanska Kiewit (WSK) as the construction manager/general contractor for the much-anticipated Green Line Extension Project (GLX). National engineering and environmental consulting firm GAI Consultants, Inc. (GAI) will serve as a subconsultant to WSK. This high-profile project involves extending the existing north Green Line branch from its existing terminus at Lechmere Station to College Avenue in Medford, MA. The Green Line extension project is located within the cities of Cambridge, Somerville, and Medford, MA.
Five new stations will be added along this branch as well as a single-stop branch at Union Square and construction of a new station at Lechmere. The extension program will be implemented by J.F. White Contracting Co., Skanska USA Civil Northeast, Inc., and Kiewit Infrastructure Co. (WSK), who will serve as the construction manager/general contractor for the MBTA.
As a subconsultant, GAI’s Train Control Systems Group will provide final design and engineering, procure equipment, support equipment installation, documentation, and factory testing of complete Commuter Rail Signal Instrument Houses. GAI will assist WSK on three contracts with the MBTA related to the Green Line extension, including procurement of long-lead items; signal installation support, testing, and commissioning for the Fitchburg Mainline; and signal installation support, testing, and commissioning for the New Hampshire Mainline. GAI established its Train Control Systems Group in early 2013 to expand the firm’s transportation services.
Founded in 1958, GAI is an employee-owned planning, engineering, and environmental consulting firm providing local expertise to worldwide clients in the energy, transportation, development, government, and industrial markets. The firm has offices in FL, IN, KY, MI, NC, OH, PA, VA, WV, and WI. For more information visit