Check out the Reddit PvE server at p.nerd.nu. It's pretty incredible what they've built without any cheats, there is a full redstone railway system with automatic switching so you press your destination button and enjoy the ride.
The town dynamic is pretty hilarious to see as well. People recruit new visitors for their towns, offer a plot of land and a horse in exchange for contributing to their great works.
> there is a full redstone railway system with automatic switching so you press your destination button and enjoy the ride.
Oh man, I remember building one of those on my server back when Redstone was a lot less functional, so I guess it was even more impressive than building the same today with all the new goodies. It had 4 different stations in total, though only the one at our central base was capable of choosing different destinations (the station was pretty big, I recall having a warehouse of NOT-NOT gates to make the proper delay I needed).
There's a similar PvP server at civcraft.vg or /r/civcraft. they don't have automated switching railroads, but considering it's an Anarchy server with cities that go "to war" with each other there is a massive railway support system and all sorts of glorious builds.
The town dynamic is pretty hilarious to see as well. People recruit new visitors for their towns, offer a plot of land and a horse in exchange for contributing to their great works.