I'm going to be taking the design I saw currently going westward and expand that at the X=-4000 line between 0 and -5000 Z.
I do have a couple questions...
1. Can those super-speed ice trails that exist in Nether also exist in overworld? Or will the ice melt and you'd have to use packed ice?
2. Horses - What I saw had a height of 2.5 in the middle area, which is too low for horses. And the width of each of the rail areas was too narrow for horses. Would expanding the middle area to include a 3-3.5 high, 2 wide trail be too non-standard? (or do people not really care).
I recently made a road almost from 0 to -5000 Z at -4000 X, and it was actually quite a lot of fun. I should be done with it tonight or tomorrow, and the more I've used and built it, the more I realize it would be easier to simply have a subway all the way. Overworld - especially with the rate at which mobs are spawning in the outer areas these days - is a bit too annoying for long-distance travel.
Is there a more updated version of the subway than the westward one I saw yesterday?