Firaxis has released a playable demo of one of this week's top releases, Sid Meier's Railroads!, giving you the chance to work through a tutorial and then play around in a smallish map that starts off in the town of Towson.
It's been built for two players, apparently, and as you start you're given 50 game-years to complete your objectives (visible by pressing the Victory Screen hotkey - F3 by default), with five trains from the US and Europe to use and new ones added every ten years in-game. The idea is to link Towson to New Freedom and other cities.
Anyway, the whole thing's just 266MB in size, and can be had from 3D Gamers. Look out for our full review of Railroads! in the near future, but in the meantime why not watch Sid Meier talk you through the game on Eurogamer TV, or read our interview with him?