It seems that you need to download a download manager of some sort first. I've tried this demo (even though I have RS on order, but I'm impatient, it took Game 3 days to start shipping!) and with the shadow detail on "Low" and all other graphic settings on "Medium", I get 20-30 FPS, compared to getting 10-20 FPS in TRS.:hehe: Physics (when you are close to derailing), I can say are a bit odder (and from my POV a little cooler) than Trainz's, the loco even sort of "jumps" when you hit your coaches a bit too hard. (Or another train.) And if you round a corner a bit too fast, the loco tilts on its side.
P.S. I was talking about when you're close to derailing. Not anything else, I don't know how fast doors are supposed to close, or about braking and accelerating. You can't really blame me, I'm only 11.