For the life of me, I can’t remember what the name of this anime is. Can anybody help?

Many years ago (like 15+) I remember watching an anime episode where a main character is sent back to his world as a monster of some kind and given the chance to stop himself from getting on a train that takes him to a new world that essentially starts his adventure. He ends up yelling to get himself to get on the train and goes back to the new world. For the life of me, I cannot remember the name of the anime or really anything else about it but just remembering this is making me wanna watch it. Does this sound familiar to anybody else? What could this anime be?