Green Line Extension Hits New Milestone as GLX Work Accelerates Into Summer

Work on the Green Line Extension surged forward this week as crews completed track installation on the final 0.3-mile stretch approaching the Medford branch terminal, marking what transit officials are calling one of the most significant milestones of 2026 for the project. The Massachusetts Bay Transportation Authority announced the completion during a Wednesday site visit, confirming that crews have now laid track across approximately 4.3 miles of the new corridor serving Somerville and Medford.

The GLX project, which has faced repeated delays and budget overruns since breaking ground in 2017, is now targeted for service launch in early 2027—a date that has been adjusted multiple times over the past eight years. The current phase focuses on final systems integration and safety testing at the Union Square station in Somerville and the Medford branch, where two additional stations will serve the Tufts University area and the future high-density development zone near Assembly Row.

"This is a transformative week for Boston-area transit," said the MBTA in a statement released Friday, noting that the corridor will ultimately reduce travel times from Medford to downtown Boston by up to 15 minutes compared to current bus service. The agency estimates the extension will serve approximately 55,000 daily riders at full capacity, primarily drawing from Somerville's rapidly growing residential neighborhoods and Tufts's Medford campus.

The project remains contentious among some Somerville residents, particularly those living along the corridor near Community College Avenue and Washington Street, where construction has disrupted traffic patterns for nearly a decade. Local business associations have reported mixed impacts, with some establishments along the construction zone experiencing revenue losses while others anticipate long-term benefits from improved accessibility.

Separately, the Boston Planning and Development Agency approved preliminary designs this week for the long-stalled Greenway Connector project, which would extend the Rose Kennedy Greenway pedestrian network across the Zakim Bridge approach toward Charlestown. While not yet funded, the $180 million project has been identified as a priority by city officials seeking to improve walkability and cycling infrastructure connecting Waterfront neighborhoods.

These developments come as the region continues grappling with aging transit infrastructure. The MBTA's capital budget remains constrained at approximately $2.7 billion annually, though state leaders have signaled potential new funding mechanisms for rail expansion could be considered during the next fiscal cycle.

Construction on the GLX is expected to intensify through autumn, with crews working extended shifts to meet the accelerated timeline.

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