I did that train test one. I had that train bot and I ran it through tunnels that would Direct it's aim to the next set. I found out later that bots can actually go through teledoors just as players do, which I took highly to my advantage and put those inside the blacked out tunnels. It was pretty nice. As for no tunnel turns that make the works of turning hidden, I can't tell how an open track would be. Lots of events or something I'm sure.