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MBTA names winning bidder for Green Line extension project

An MBTA Greene Line train travels along the intersection of Commonwealth Avenue and Harvard Street in the Allston neighborhood of Boston, MA.
Green Line Constructors, a joint venture of several engineering and construction firms, will design and build the Green Line extension. –Keith Bedford/Globe Staff

The MBTA has named the winning bidder for the agency’s largest-ever construction contract, for the 4.7-mile extension of the Green Line through Somerville and Medford.

Green Line Constructors, a joint venture of several engineering and construction firms, will design and build the additional service, which includes seven new stations from Lechmere in Cambridge to Tufts University. The company said it could build the expansion for $1.08 billion, well below a maximum price required by the T, and has promised to restore portions of the project that were previously cut like a key portion of a bike lane, elevators, and a vehicle maintenance facility.

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The award, which must be formally approved by the agency’s board later this month, marks a significant milestone for the long-planned and long-delayed rapid transit project that underwent substantial changes after ballooning costs threatened to kill it altogether in 2015.