bowed my head. and i was just kind of praying please make it stop, please make it stop. if felt like we were gliding along for a little while there. i don't know if it only felt that way or maybe only a few seconds i was just praying the train didn't tip any more. i was just thinking we were going to fall all the way on our side. we did eventually stop. and everyone was screaming. i stood up i realized i wasn't hurt. thank god. immediately, i was asking everybody around me are you okay are you okay? >> now a team of ntsb investigators will be on the scene in philadelphia at first light, trying to determine exactly what caused this amtrak train to go off the rails. one expert telling cnn speed is likely a factor. >> as soon as the ntsb downloads