Guys i'm litteraly overwhelmed with the greatness of Metro 2033 gameplay. There are some intresting makeshift engines that roll on the rails. Everything from a trike to a hand cart and a handcart with motor on it which as a speed of 10km an hour max. The route dose have the russian metro train as well. Here you can find out more about the type of railcars this route features which will be part of this route: http://metrovideogame.wikia.com/wiki/Railcar The metro subway system is quite intresting on it's own so making this into a a post-apocalyptic version with makeshift railcars and dynamic enviroment where we could see the metro citizens, probably no fighting or or monsters but you can still do many things in the abadonted tunnes like passanger service, rolling hand carts up and down small passageways which deliver supplies to various stations. Probably there will be no need for tanks either. but the hand cart, metro russian train, the railbike two will be usefull. The nice echo sound of the tunnels will be amazing two. This project is merly science fiction but It will be very rewarding to experience especially for all the metro 2033 fans.