A band of good Samaritans jumped to the rescue of a 44-year-old woman who fell on to the Orange Line tracks Tuesday at Back Bay Station.
Surveillance video released by the MBTA showed the woman, appearing to be unaware of her surroundings, stepping right off the platform and falling into the train pit.
Several bystanders then jumped in to lift her out. The incident happened at around 8:45 p.m.
The MBTA said the woman experienced pain on the right side of her body and was taken to Tufts Medical Center for treatment.
She made no contact with the deadly, high-voltage third rail and there was no train nearby, MBTA spokeswoman Kelly Smith said in an e-mail.