never seen anything like this in my life. matthew wald joins us now and he is an accident expert. math yo matthew, you said this is one of amtrak's worst accidents? >> yes. the railroad has a pretty good safety record and the northeast corridor generally has a good safety worker. they have occasional accidents where a track worker is struck. these accidents are infrequent and there's a reason. they are pretty well engineered and pretty well maintained. something has gone wrong either with the train or the track or both. they are both amtrak's problem, both amtrak's issue. in the past they have had a crash because i think it was back in the early 70s because