Terror Train (1980) | HORROR/SLASHER | FULL MOVIE

A college fraternity prank goes wrong and a student ends up in the mental asylum. Three years later, it's graduation time, and the members of the fraternity decide to have a costume party aboard a train trip to celebrate their graduation. Unknowingly to them, a killer has slipped aboard, killing them off one by one, disguised in the costumes of the victims.

IMDb: https://www.imdb.com/title/tt0081617