I hadn't had anything concrete in mind before starting this, other than wanting it to be Metro themed. Now that we've pretty much decided London as the setting I'll be able to write that lore up. Right now I'm thinking that the local political figures were evacuated into a station together and essentially formed what would be the continuation of Parliament. Initially they would have tried to maintain their control throughout the entire Tube, though over time that control would diminish to only a few stations, with other factions taking hold throughout the Tube. As these things are established I'll be adding them to the OP.