Baccano!, Kimetsu no Yaiba Movie: Mugen Ressha-hen Recommendations
The chaotic antics on a Highspeed Locomotive!
(Obvious Disclaimer) Demon Slayer Movie is a sequel to its first season and in watching the movie first will be making a rather big mistake.
This comparison is rather simple, both stories have a steam train as a major set piece, both in which terrible things are happening on them.
The major difference between the two is that of its Genres, but if you're a train fanatic like myself I'd highly advice watching the other.