Self-unloading railcar dumping bridge.
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Previously:
https://www.homemadetools.net/forum/...346#post181331
https://www.homemadetools.net/forum/...737#post124083
https://www.homemadetools.net/forum/...970#post120026
https://www.homemadetools.net/forum/...814#post111682
https://www.homemadetools.net/forum/...374#post135259