two other trains were hit with rock like objects that night. could that have caused this or been one of several factors? >> no. listen -- forgive me the train is now coming to my station. as you and i know as we've covered accidents over the years. whether planes trains, automobiles, very often it's not a single factor that causes an accident. it's a chain of factors that causes accidents. the question is this an engineer that's been on that track a three weeks. three weeks, that it. suddenly he's coming out of philly and hears on the radio, we believe, the engineer reporting he was just shot at. that's what the other engineer reported. he gets on his train and gets hit by something. we don't know if that happened, but if it did, did it disorient him enough that he forgot he had