The Polar Express is about faith, and the power of imagination to sustain faith. It's also about the desire to reside in a world where magic can happen, the kind of world we all believed in as children, but one that disappears as we grow older.
Way down deep, we're all motivated by the same urges. Cats have the courage to live by them.
I very rarely came across rude or disrespectful people. I don't know how I slipped by all of them, but I honestly can't think of one experience off the top of my head that was like that. I'm sure they're there, but I'd have to think really hard to recall them.

