How does it work?
You can sorta see here (it only goes 1 stop, so only 1 slot on the board is filled in)https://www.youtube.com/watch?v=ml1erSJu1Zo …
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Here's an older model https://www.youtube.com/watch?v=2_R0u4bNMKo …
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If only the US had as extensive a railroad and metro network as Tokyo, Berlin, Paris, or London
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