Steam motorcycle by Mark Sanderson.
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Previously:
https://www.homemadetools.net/forum/...064#post153406
https://www.homemadetools.net/forum/...395#post122132
https://www.homemadetools.net/forum/...466#post122599
https://www.homemadetools.net/forum/...638#post118121
https://www.homemadetools.net/forum/...149#post138296