Railroad track laying machine.
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Previously:
https://www.homemadetools.net/forum/...606#post143314
https://www.homemadetools.net/forum/...987#post120128
https://www.homemadetools.net/forum/...1502#post74535
https://www.homemadetools.net/forum/...917#post119761
https://www.homemadetools.net/forum/...777#post136901
