Looking for good mystery set on a train.

Preferably a who-dun-it in an older time period, like think 1800s. Bonus points for murder mysteries and/or supernatural elements.

I just remembered a Poptropica island I loved from my childhood where you had to solve a robbery before the train reaches the World Expo in France. Looking to find something that reminds me of that vibe but I’m not familiar with the mystery genre as I’m more of a horror/fantasy fan so I’d like to know where to start.