GLX Constructors: One Team with One Goal to Deliver the Green Line Extension Design Build Project

Fluor, a FORTUNE 500 company, has been delivering the most complex and challenging construction projects around the world for over 100 years. Fluor is a global leader in the development of transportation infrastructure, executing more than $20 billion in complex alternative-delivery projects and consistently ranking #1 or #2 on ENR’s Top Design-Build Firms list. Fluor’s experience includes the delivery of significant light rail, commuter rail, high-speed rail systems, and major transit stations in dense urban environments. For more information about Fluor, visit

Founded in 1972 and headquartered in Littleton, Massachusetts, Middlesex is one of the largest and safest heavy/civil contractors in New England. Ranked #243 on ENR’s Top 400 Contractors in 2016, Middlesex has focused their last 44 years on the construction of transit, bridge, and infrastructure-related projects throughout New England. Middlesex has constructed numerous projects for the MBTA, including the Newburyport Commuter Rail Line, Canton Viaduct Rehabilitation, Anderson Regional Transportation Intermodal Center, and numerous commuter rail stations. For more information about Middlesex, visit

Herzog has been a leader in the transit and infrastructure industry since beginning operations in 1969. The firm has successfully completed nearly 20 alternative-delivery rail transit projects to date, totaling over $5 billion. Herzog’s focus on building strong client relationships, keeping exemplary safety practices, and minimizing disruption during construction has resulted in notable project awards throughout the United States. For more information about Herzog, visit

Balfour Beatty’s infrastructure division excels at large, complex projects—their rail transit business includes 22 light rail transit projects. Bringing a proven record of delivering safe, high-quality civil and systems transit infrastructure projects across the United States, Balfour Beatty is a subsidiary of the largest, most diverse rail contractor in the world, Balfour Beatty, plc. For more information about Balfour Beatty, visit

As GLX Constructors’ lead designer, STV brings local and national expertise in design build project delivery. STV is an award-winning professional firm offering engineering, architectural, planning, environmental, and construction management services. STV has worked on hundreds of rail transportation projects for the MBTA and MassDOT, focusing on stations, track and right of way, bridges and tunnels, terminals, and depots. For more information about STV, visit