The other one I've seen was a vintage tractor, probably a Lanz running on kero I think. Running the engine in reverse was its reverse gear. It had a huge flywheel and it could run that slow that the driver could "bounce" it back and forth between compressions on two cylinders, and when it bounced backwards he would add fuel and off it would go. I have video footage here of one doing this at the Dardanup Heritage Park, and I was a bit surprised that I couldn't find anything about it on youtube.
Lanz motors are single cylinder two stroke, the early hopper cooled model did not have a reverse gear, later ones had a reverse gear, had to keep an eye on the oil pump drive to know engine direction. Later ones had the oil pump out of sight and had a spinning disc, needed to know which way you might go when engaging the clutch!
Fuel was crude oil.