I heard somewhere that
ST is about 100 years after
PH.
ANd the train is just a land-counterpart to the boat. They both run on steam power, and they weren't physically invented too far apart from each other in our world, so seeing a trian after a steam ship isn't too far fetched. They also had guns before steamships, so if they didn't exist in
PH, they have probably been completely removed from that dimension so the games wouldn't be rated T.
I actually like the train. I don't know, sometthing about the idea just appeals to me. I mean, wasn;t there a time in everyone's life when they wanted to drive a train? Well, here's our chance people.