It would be great to have a route and scenario of Polar Express. Just a suggestion. I think it would be very fun.
Steam locomotive would just roll down the hills all the time, and you couldn't finish the scenario... also, I have no idea how the frozen lake scene would be recreated, not to mention the cracking ice in that scene. But the idea is good. I'd be happy with just its real life counterpart too though, Pere Marquette 1225.