The market in civcraft was really impressive. I remember when Bitcoin was less than a dollar, you could buy 60 diamonds for a Bitcoin from one user.
I made this map here http://txapu.com where you can see rail connections. The map tiles are collected and submnitted by players, and the live player list comes from an in-game bot.
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.
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).