Rails Of War
Rails of War is a combination of a railroad game and war game.
You control a train that is loaded with weapons (nothing like a shooting train :) and you need to achieve various goals in your enemy's territory (pick up things, drop them off, repair your train...).
In the mean time, your enemy keeps coming at you with tanks, planes, and other military vehicles, in order to try to shoot your train out.
The graphics are pretty cool and it's a real fun game to play.
Play the game