The incident began at around 3:45 p.m., as an Orange Line train was stopped approaching Roxbury Crossing, according to the transit agency.

Officials said they are investigating what caused the door to open but have ruled out an issue with the train itself or a mechanical problem.

This week, the commission that oversees Metrorail on safety said there has been a rise in the number of incidents in which train doors open either on the wrong side of the train or in a place where it ...

Catherine Beck ranks herself as “a medium” on the train nerd scale.