MBTA Signals Green Light on Green Line Extension Work While Orange Line Closures Loom This Summer

The MBTA confirmed Thursday that the final federally mandated safety inspection for the Green Line Extension's Medford branch will wrap up before Labor Day, clearing the way for a full-frequency service restoration that riders along the Somerville and Medford corridors have been waiting on since capacity restrictions were imposed last September. At the same time, the agency released a revised schedule for Orange Line track rehabilitation between Wellington and Back Bay stations — work that will force weekend shutdowns every Saturday and Sunday from July 19 through September 7.

The timing matters because the MBTA is still clawing back public trust after years of derailments, federal safety oversight, and a Federal Transit Administration consent decree that technically expired in January but left behind a shadow of scrutiny that agency leadership knows it cannot afford to ignore. Governor Maura Healey's administration tied $485 million in capital funding announced last spring directly to performance benchmarks. Miss those benchmarks, and future tranches get delayed. That creates real pressure heading into a summer when every bus bridge and shuttle replacement van becomes a political story.

Orange Line Work and the Commuter Pain Points

The Orange Line shutdowns will hit hardest at Forest Hills station in Jamaica Plain and at Back Bay, two of the system's highest-volume stops outside downtown. During the 52-day closure window, the MBTA says it will run free shuttle buses along Washington Street, a route that advocacy group Livable Streets Alliance has been pushing to convert into a permanent Bus Rapid Transit corridor anyway. The shuttle plan calls for 12 dedicated buses operating every eight minutes during peak hours — a frequency level the Orange Line itself doesn't always hit on a normal Tuesday.

Dorchester riders using the Fairmount Line will not see direct Orange Line disruptions, but the MBTA warned that increased shuttle traffic could slow bus service along Melnea Cass Boulevard, where the 28 bus already runs behind schedule roughly 40 percent of the time according to the authority's own June performance dashboard. Riders connecting from Mattapan and Roxbury should expect to add 10 to 18 minutes to their downtown trips on weekends.

Mayor Michelle Wu's office released a statement Thursday pointing to the city's $4 million contribution to the Washington Street Improvement Project, which includes new bus lanes and signal priority upgrades from Nubian Square to Massachusetts Avenue. That work is proceeding on a parallel track and is scheduled for completion by December 2026, though city officials privately acknowledge the December target is optimistic given supply chain delays affecting signal hardware.

Green Line Progress and What the Numbers Show

On the Green Line Extension front, ridership at the eight newer stations — including Union Square in Somerville and Lechmere, the rebuilt hub at the edge of East Cambridge — averaged 18,400 boardings per weekday in June, up 23 percent from June 2025 but still roughly 11 percent below pre-pandemic projections that justified the $2.3 billion project cost. MBTA planners attribute part of that gap to the service frequency restrictions imposed last fall after inspectors flagged track geometry issues near the Gilman Street maintenance facility in Somerville.

The full inspection report is due to the FTA by July 18. If federal reviewers sign off without requiring additional remediation work, the MBTA has said it can restore six-minute peak headways on the Medford branch by mid-August. That would add roughly 3,400 additional seats per hour during morning rush, a number that matters to the thousands of employees commuting to the Kendall Square biotech corridor and to Tufts University's Medford campus.

For commuters planning their August calendars, the MBTA's trip planner will post the finalized summer schedule by July 11. Riders who depend on the Orange Line between Forest Hills and Downtown Crossing on weekends should download the MBTA's real-time bus tracker app and allow for the longer shuttle windows. The agency is also staffing ambassadors at Forest Hills and Back Bay starting July 19 to help passengers navigate the changes on the first affected weekend.