Fuel bar and the heat bar refers to the last wagon.
If the heat bar is full, the train accelerates.
If the fuel bar is empty, the last wagon will be detached automatically.
If the last wagon is empty, the train slows down.[id]http://games.mochiads.com/c/g/nuke-express/nukeExpress.swf?affiliate_id=4cef20d9623f787d[/id]