I actually have a commercial version of an engine like that :) A wilesco D2 - https://www.wilesco.de/en/steam-engines/stationary-steam-engines https://www.wile

I actually have a commercial version of an engine like that :) A wilesco D2 - https://www.wilesco.de/en/steam-engines/stationary-steam-engines https://www.wilesco.de/en/steam-engines/stationary-steam-eng... Its mostly a deskoration. I took it apart and it has the sliding block design as described in the link.