Well, as I say I've played all the flight and train simulators, and it's possible to cruise at a steady speed for hours on end, but why would you want to? Train simulators in particular are one of those things you either get or don't get, I'm an old model railroader from way back so I enjoy creating routes and sessions and reskins, and switching cars around in industries. Short haul stuff, long mainline runs put me to sleep. Not for everyone, you're either a railroad fan or you aren't.
From the makers of Trainz, the trainsim I play the most, here's some weird ones;
http://www.simulatorcentral.com/inde...simulator.html
http://www.simulatorcentral.com/inde...mulator-2.html
http://www.simulatorcentral.com/inde...ator-2011.html
http://www.simulatorcentral.com/inde...ator-2011.html