Trainz hasn't mastered train simulation. for one thing, when cars are hooked up to engines, they're only coupled, no air hose or brake connections. second, they don't have the functions of moving lights at all. the startup of stuff you get when you download Trainz is ok but not good. last, whenever you create aswitch, it's just track overlappping each other. it doesn't look like a real switch at alll. on the other hand, MSTS Doesn't have industries at which you can load/unload rail cars. they do have a good startup selection of engines and cars and their surveyor creator looks cool. I have never owned MSTS so i'm just guessing.