​On April 10, 2022, about 12:30 a.m. local time, a Massachusetts Bay Transportation Authority passenger was dragged and killed as a northbound Red Line train departed the Broadway Station in Boston, Massachusetts. Station surveillance video reviewed by National Transportation Safety Board investigators showed that as the train was departing, the accident passenger attempted to exit the train using the middle passenger doors of the second railcar of the six-car train. The doors closed on the accident passenger’s upper body as he stepped back onto the platform, and as the train departed the station, the passenger collided with a wall at the end of the platform and was killed.

​We determined that the probable cause of the April 10, 2022, passenger fatality was a short circuit in the passenger door interlock circuit on the accident railcar that enabled propulsion on train 1034 with the door obstructed by a passenger, causing the passenger to be dragged along the platform. ​