Yes. Most other games require a lot more space, which we lack, or ... fewer people.

[And wouldn't that just get in the way of the desire to have lots of people playing??

Though he wouldn't mind more space. Something big enough to split the train into teams and just goof off with entire ballgames or something.]

I know two of them are! I'm not really sure about Prisons and Gryphons, and that one's a multi-session thing anyway.