The United Railway (OLD)

This game is no longer being worked on and therefore does not receive updates anymore. - The new-ish version of the game, made after the first attempt of Project Mainline, this one was an attempt to revive the mainline like I had always envisioned. But with everyone leaving to work on other things or just not being there enough, you can likely tell it crashed and burned overtime. A lot of things were added and removed over the course of this game's life. The 'original original' game got suddenly turned into a blank baseplate by roblox, leaving zero traces of it. And since surfaces were removed, many engines had to be rebuilt. Some survived, others broke instantly before being added as they weren't tested well enough.