Dave --
"I have almost come to the conclusion that almost all stations are Hi-Poly. Am I correct?"
I'm glad you qualified that statement with "almost", 'cause you probably haven't tired my routes. If you do, you might be pleasantly surprised. Even these area gives good frame rates with all sliders maxed and shadows on:
It's just a matter of design.
Phil
(The routes are "PortOgden&Northern" and "IndustRail".)
Screen Shots Snipped.