[art] track loop the crosses the same tile 3 times.

[blauw67]

I made this totally useless piece of track, so let's call it 'art' or 'thought experiment'. This loop of track crosses over two tiles 3 times, without any track intersections. Trains can also make use of it.

[odisseus]

You could add another level by building a sideways tunnel below your tunnels. In fact, it is possible to build an arbitrary number of stacked tunnels, all connected in a loop.

stacked-tunnels.png

A loop that consists of multiple stacked tunnels.

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