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IRE does, historically, have a similar system. Imperian had caravans, I don't know if they still have the same system because I believed it changed, but when I played you could get a caravan from your city/friendly city and then travel to the various townes to gather raw materials and deliver them to your city. NPCs would attack you and other players could also steal the caravan from you and take the commodities to their city instead. The caravans moved slowly so it wasn't a quick process, there was normally a delay with some flavor text when attempting to move the caravan from one room to another.