Sabrina, the Teenage Witch (1996)

S6E4 Murder on the Halloween Express

Sabrina gets inspired by Salem's holiday suggestion and invites her friends on the eerie Mystery Train for a Halloween escapade. However, there's a catch: the train is in the Other Realm. Sabrina quickly discovers that the mortals can only escape if she unravels a perplexing mystery, reminiscent of a 1920s detective film, when she returns to the scene.