Donald, I haven't actually tried any of these, but the screen shots look pretty good on some: Model Railroads.Net Link to Software for Train Sims [ 21 December 2001: Message edited by: Graphite ]
I also play Railroad Tycoon II. I have the Gold edition, which includes "the second century" expansion pack. I've found that http://pages.unisonfree.net/jmh/rrt2/rrtii/frames.htm is a good site to download new maps if you get bored with the maps it comes with. I highly reccommend the Atlantis map Imagine a 4 track mainline intersecting several double track lines in one giant junction