Train wheelset dolly.
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Previously:
https://www.homemadetools.net/forum/...690#post178499
https://www.homemadetools.net/forum/...192#post126310
https://www.homemadetools.net/forum/...632#post182482
https://www.homemadetools.net/forum/...708#post133110
https://www.homemadetools.net/forum/...572#post147444