Basically the idea is that after the nuclear apocalypse, the world became a deserted wasteland and after oil ran out, people turned to coal and started using armored and weaponized trains to get from place to place. The biggest civilizations are boom towns where fresh mineral deposits have been found. Cars are still a thing, but are mostly just used by raiders to gang up on civilian trains and such. The two ways this could go Is a bunch of scavengers finding a train, fixing it up and upgrading while traveling across the country to take on the resident warlord in the area. On the other hand, it could be a lone group of raiders each with separate cars who Chase down mineral trains and such. I'll make an OOC if I get some interest.