I saw it in the late 80’s/early 90’s. No later than 94, no earlier than 85. It was about some sort of spirit, or poltergeist, terrorizing a young woman on a train. I can’t remember if it was affecting the whole train, or just her, but she was the main focus of the movie.
Amok Train (Beyond the Door III) (1989)?
http://www.imdb.com/title/tt0096920/?ref_=fn_al_tt_1