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I think the teleporters should be like tunnels. If you wanted to make them connected, you could place tunnel blocks that make it look like it's connected out there. And if you didn't connect it with the tunnel blocks, the tunnel would look like it's going underground and the end part of it would look like it's coming up. Teleporters that look like tunnels would really be nice since the game is about trains.

This is a really nice idea, thanks a lot!