First release:
- concrete, rails, signals, power.
- biters, rocks, decoratives shouldn't impose on concrete.

possible improvements:
- make it 2 rails per side instead of 1 (optional setting)
- north south (optional setting)
- linear spawns for multiplayer (optional setting)
- concrete as optional setting

Have it remove rocks as well as the trees, please.

Thank you.

P.S. This is a cool mod.!

seems interesting

I created this on a whim so here it is.

This sounds an awful lot like https://github.com/justarandomgeek/factorio-railborders ...

Hadn't seen that. We've started a ribbon world using this Central Rails mod (using factorio's own ribbon world setting) with the rails down the middle. It's an interesting play.

A friend of mine is also going to try a combination with Sea Block. He's identified a possible need for a linear spawn position setting for multiplayer. I haven't had a chance to use Sea Block other than starting it up once.