Monorail track switch.
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Previously:
https://www.homemadetools.net/forum/...657#post155615
https://www.homemadetools.net/forum/...811#post167495
https://www.homemadetools.net/forum/...966#post210511
https://www.homemadetools.net/forum/...671#post223245
https://www.homemadetools.net/forum/...057#post184193
