Last Train to Oblivion

S5, E7: Peter becomes trapped on a train with Casey Jones' ghost and it's up to the other guys to save him, before the train he has hijacked reaches oblivion. However, Casey Jones actually seeks redemption for a terrible train crash over a hundred years ago, which the Ghostbusters are unaware of as they try to rescue Peter, by chasing down the train and trying to survive Ray's crazy plans and driving.