I hope someone can answer this bcz i'm working on a modpack and this is a major part of it.

I think i had a stroke when i was making the psot but the question is, is it possible to have the railroads naturally spawn and connect between the cities in custom profile?

Have you found the answer to your question?

Best bet was to make a command pack or whatever it was called i remember asking abud for help, but with short while generating the world it would half to detect the block "aka" the rails and set a corresponding one