An unmanned train is running wild through the cities of America. The only way to stop this train from killing everyone on board is by building tracks in enough time to make sure the train can safely make it through each area. Be sure to watch your funds as things such as bridges and explosions cost you a lot of money.
As each level starts, you will have to connect the green dot with the exit door. To do this, click and drag your mouse around the screen to lay down a path for the railroad tracks. You only have a short time before the train begins to come, so think quickly. Cause too much damage and the whole city will be blown to bits.