Green Line Extension Hits Critical Milestone as Summer Construction Season Accelerates

The Massachusetts Bay Transportation Authority announced Tuesday that structural work on the Green Line Extension's final two stations—College Avenue in Medford and South Medford—has reached 85 percent completion, marking the most significant progress checkpoint since the project's troubled restart last autumn. The $2.3 billion undertaking, which has faced repeated setbacks and cost overruns since 2008, now appears poised to deliver service by early 2027, officials said.

The extension will add 4.7 miles of new track running north from Lechmere Station in Cambridge, ultimately providing direct rail access to Union Square in Somerville and deeper into Medford's residential corridors. For commuters along the Broadway corridor and Route 16 vicinity, the implications are substantial: current bus-dependent residents face average commutes of 45 minutes to downtown Boston, a figure expected to drop by nearly half once service begins.

"This week's completion of platform construction at both terminal stations represents the kind of momentum the project desperately needed," said the MBTA in its official statement, noting that track-laying operations are now scheduled to commence in earnest throughout July and August while summer weather permits. The accelerated timeline comes after the authority invested an additional $180 million into workforce expansion and supply chain improvements following last year's extensive review.

Local impact remains mixed among affected communities. Residents on College Avenue report ongoing disruptions from construction traffic, with several blocks along Tufts University's northern boundary experiencing lane closures through September. Meanwhile, property values in immediately adjacent areas have appreciated approximately 12 percent over the past eighteen months, according to Zillow data, as prospective homebuyers anticipate improved transit access.

The project's delays have long frustrated regional planners. Originally slated for completion in 2011, the extension languished through design disputes, contractor failures, and budget crises that made it a case study in Boston-area infrastructure inefficiency. Recent completion of the D Branch to Riverside Station in Newton in 2022 provided some redemption, but the Green Line Extension remained stubbornly delayed.

Transit advocates emphasize the extension's environmental benefits. Projections suggest the new service will remove approximately 8,000 daily vehicle trips from area roads by 2030, reducing regional carbon emissions by an estimated 24,000 metric tons annually. For Somerville and Medford officials, the project represents long-awaited validation of their transit-oriented development strategies.

The MBTA has scheduled a public progress meeting for July 14 at the Medford City Hall auditorium, where engineers will detail the construction timeline and address community concerns regarding the final phase of this transformative regional project.

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