Currently I think that a pretty bad execution of the idea :
1) Multi-line roads would be made with multiple roads next to each other, this is already usable that way so why being redondant ?
2) Very low resolution texture ? Serriously ?
3) No curved rails, would have put plain colors placeholders ...
4) Modifying the bounding box of the rail make it impossible to remove correctly.
5) Oversized texture doesn't solve any problem ...
6) Final sugestion, your mod should add tiles under the rails so you could run faster.

YESS!! Petremann, thats great suggestions... Thanks!!!! I will try to solve some of them... This is a draft of the idea, now is the time to improve it!

Im very noob and amateurish in that mod area... Im having these ideas but i really cant "execute" them the way i wanna... Im putting all my ideas in the mod portal hoping that someone more capable will take over the mods, for that i'm bringing to Factorio Forums a idea for a more "cooperative" way to do mods here, instead of individually that way....

I really hope to pass all my ideas for someone with more time and more experience, for that, all my mods is unlicensed "Public Domain" ! XD