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the head-on collision came during the morning commute and sent 33 people to the hospital. it sounds like a man. stop the train, stop the train. it was a crash and then smoke everywhere. reporter: initially foul play was suspected, that someone intentionally sent an empty four-car train head on into an eight-car train full of commuters. surveillance video and witness accounts indicate no one was at the controls of the runaway train, which was traveling at an estimated 20 miles an hour at impact. at this point, investigators have not found any evidence of wrongdoing. there s no broken windows, no pried open doors. no graffiti or vaned lix inside the rail car. we are doing a thorough investigation of this. reporter: but transit officials say someone must have started the train, which had been sidelined for repairs. the question is why. and how come two separate automatic emergency shutdown systems failed? it should have went through a

Head on collisionMorning commuteSurveillance videoOpen doorsVaned lixEmergency shutdown systemsTransit officials