Railroad track laying machine.
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Previously:
https://www.homemadetools.net/forum/...564#post170280
https://www.homemadetools.net/forum/...455#post154794
https://www.homemadetools.net/forum/...606#post143314
https://www.homemadetools.net/forum/...994#post133943
https://www.homemadetools.net/forum/...929#post164185