On October 1, the Massachusetts Bay Transit Authority's Green Line was interrupted by an unexpected jolt. A train, carrying approximately 50 passengers and 2 crew members, derailed near the Red Bridge interlocking in Somerville. According to the National Transportation Safety Board (NTSB), the derailment occurred at 4:46 p.m. as the eastbound train 3874-3718 was exiting Lechmere Station heading towards its next stop.
The NTSB report identifies a significant breach of protocol, noting that the train entered a zone with a speed limit of 10 mph while traveling at 36 mph and ignored a double red signal that required an immediate stop. Investigators are working to reconstruct the sequence of technical failures and human errors that contributed to the incident. The NTSB has stated that their ongoing investigation will focus on compliance with speed regulations and the oversight mechanisms that failed to prevent the accident.
What is known is that the derailment resulted in injuries to seven individuals, who were promptly taken to a local hospital with minor injuries, while the remaining passengers and crew were uninjured. Estimates of the damage to the train and infrastructure are still being determined, but a detailed inspection of equipment and track conditions by the NTSB is expected to provide a comprehensive assessment soon.
The investigation—which includes reviewing locomotive event recorders, analyzing signal systems, and examining footage from security cameras—draws on the expertise of several entities. Participants in the investigation include the Federal Transit Administration, Massachusetts Department of Transportation, Department of Public Utilities, MBTA, and Boston Carmen’s Union 589. These groups are tasked with investigating the incident and working to improve measures to prevent future occurrences.
