Horror train

This film is a remake of the movie "Death Train". The protagonist, Alena, and her group once played a prank on a college freshman. They tricked him into sleeping with someone, only to find out it was a corpse, which ultimately caused the freshman to be hospitalized in a psychiatric ward due to shock. A few years later, Alena and her group reunite to hold a costume party on a train. As they indulge in the party atmosphere, the attendees start getting killed one by one. It turns out that the college freshman who was previously humiliated has come for revenge. He infiltrates the train, changing costumes frequently, and brutally murders the college students using various methods.