george bible says that while traveling by train is safe, they should be concerned about the tracks and not speeding injunires. >> the rails can fracture from metal fatigue or they can move round and shift or anything else that moves. the common ones are wheels, bearings and axals. >> coincidently, the site of the crash in philadelphia is in the same area where the nation saw one of its deadliest train sdints history. a train traveling from washington to new york went off the tracks killing 79 people. in 1943. >> so awful. we'll be right back with more.