Train washing system.
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Previously:
https://www.homemadetools.net/forum/...3423#post99048
https://www.homemadetools.net/forum/...875#post102727
https://www.homemadetools.net/forum/...849#post217009
https://www.homemadetools.net/forum/...935#post213691
https://www.homemadetools.net/forum/...668#post136571