The main line of Korokeria is the result of 263 years of development and building. Each line has 3 rails spaced equally placed side by side. Each rail is 5 feet wide, totaling 20 feet in width including spacing. 1 line thickness = 1 rail, though if this becomes too much for detailed maps, it can be scaled down.
Eagle told me to do this, it's canon. I suggest each of you make your own more detailed rail maps for your provinces.