I made some stops and switches at the main station. There's a starting point to launch the carts from, and switches to get from the top rail to the bottom, and vice versa. I think they all work correctly, but let me know if they don't.

Also, the rail is really inefficient. I'm thinking about cleaning it up at some point, but it'll be a lot of work. You only need 1 powered rail every 38 blocks, although having it the way we do doesn't really hurt anything.