911 audio -- Green Line call for help

Ben Papapietro, 19, visited Min Perry in the hospital. Ben Papapietro, 19, visited Min Perry in the hospital. (Mark Garfinkel / Pool photo)
Ben Papapietro is credited with rushing to the aid of Min Perry of Wellesley, who was trapped in the wreckage of the trolley crash. Click play below to hear Papapietro's 911 call.