That sounds really interesting, though I am not sure how that would play like. The idea of being forced to build railroads to transport troops kinda sucks, but using railroads as supply lines that go to different resources might be cool. Then, you can build some sort of harvesting building at a resource (a mine at a quarry, a lumberyard at a forest, etc.), have a railroad coming from it to the main civic center, and get resources much faster and simpler.