I love this. As another poster brought up, plenty of people buy enjoyable cars and motorcycles for the pleasure of driving. Why not add a little spice to life?
The majority of uses should be for people trying to get someplace. If the trip is also fun that is a bonus, but if it is only fun but otherwise worthless (that is something else is enough better) your system won't get many riders.
A lot of people have recreational boats. They go places but the destination isn't half the fun. With cruse ships the destination is perhaps 5-10%?
Maybe we got it all wrong. Perhaps trains should have lan gaming. Have some exclusieve game that one can only play in the train with some exclusive content for the specific trip.
One could also do exclusive interactive educational material. There is a lot to learn before you become a train driver, train manager, mechanic, engineer, cleaner, etc etc