A person was struck and pinned beneath an MBTA Green Line B Branch trolley near the intersection of Commonwealth Avenue and Washington Street in Brighton late Wednesday night, prompting a heavy emergency response and major service disruptions along the corridor. The MBTA issued an alert shortly after 9 p.m. describing a medical emergency at Washington Street, and emergency communications from the scene indicated the pedestrian was non-viable at the time crews arrived.
According to Boston 25 News, the Suffolk County District Attorney's Office responded to the area of Washington Street and Commonwealth Avenue for a person under a trolley. Officials had not released the person's condition as of the station's report, and the story remains developing. The MBTA replaced Green Line B Branch service with shuttle buses between Babcock Street and Boston College because of the medical emergency, and trains on the line faced delays of about 30 minutes, with some cars standing by at stations. Boston 25 News said it had contacted MBTA Transit Police for more information.
A Stretch of Track Where Trolleys Meet City Streets
The B Branch runs in the median of Commonwealth Avenue at surface level, meaning streetcars cross open intersections like Washington Street directly alongside car traffic and pedestrian crosswalks, according to background compiled from Wikipedia's entry on the Green Line B branch. That street-level design is what puts trolleys, cars, cyclists, and pedestrians in close, repeated contact along one of Boston's busiest university corridors.
The stretch has seen other serious incidents in recent weeks. On September 29, a collision involving a bicyclist and a pedestrian near the St. Mary's Street Green Line stop left a woman critically injured, as reported by The Daily Free Press. Commonwealth Avenue carries heavy foot traffic from nearby university campuses and residential neighborhoods, concentrating pedestrians, cyclists, and trolleys onto the same shared right-of-way.
Safety Upgrades Underway Across the Green Line
The incident comes as the MBTA works to install the Green Line Train Protection System, a collision-avoidance technology meant to track real-time train speed and position and warn operators before collisions or signal overruns, per the MBTA's project page. A June 2026 report from the Massachusetts Department of Public Utilities to federal regulators set a mandatory completion deadline of August 31, 2026, for the first phase of real-time collision detection on the system's Type 7 vehicles. It remains unclear whether that technology, or any onboard warning system, was active on the trolley involved in Wednesday's incident, and the precise pedestrian signal state at the Washington Street crossing has not been addressed by officials.
The MBTA is also in the early stages of replacing its aging Green Line fleet. Hoodline previously reported that the agency received its first Type 10 supercars this month, part of an $816 million order for 102 low-floor articulated light rail vehicles built by CAF USA to eventually replace older cars on lines including the B Branch.
A System Under Scrutiny
Wednesday's incident follows a string of recent Green Line safety concerns. A February 2025 collision at East Somerville Station injured six people and caused $6.6 million in damage after an in-service train exceeded the posted speed limit and ran a red stop signal, with federal investigators determining the train had been moving 32 mph in a 25 mph zone before impact, Hoodline reported in coverage of newly released crash video. A 2022 Federal Transit Administration inspection separately found that the MBTA experienced a higher rate of reportable safety events and rail derailments than industry peers between 2019 and 2022, a review that produced five special directives requiring immediate track and operational safety fixes.
The MBTA's 2024 Transit Safety Plan sets an explicit agencywide target of zero annual fatalities across all transit modes, backed by joint labor-management safety committees. Under Massachusetts General Laws Chapter 258 Section 2, claims involving serious bodily injury or death against the MBTA are exempted from the state's standard $100,000 public employer liability cap that applies to most municipal claims. Neither MBTA Transit Police nor the Suffolk County District Attorney's Office had publicly determined a cause for Wednesday's incident as of this report.
