I'm not making a rail system, really, just a highway, though I would like to put a subway under it in the future. I've never really planned out a rail system before, though. I'm getting a road system in place so I can begin planning out a power grid.
EDIT: The road has reached near mikethor's place, and I plan on extending it to reach SenHai's great wall of China or whatever the hell that is. I'm coming from the other direction (the factory) to reach Minimum, probably, since I don't want to mess up the nice waterway between mike and senhai.
I've also started a road out to Camp, PMorgan, and Mazder, but that will take some time to complete.
EDIT2: This is the map I'm partially basing things off of but it's at least a week behind:
http://map.rumfish.net/game-iv/#layerId=LayerA&worldX=-73&worldY=0&worldZ=465&zoom=3 I'm still surveying things myself before actually building roads.