The old "Atlas" and "Washingtons" have a top RPM of about 350 RPM and are reversed by stopping the engine, the cam slids fore/aft to the other set of lobes, compressed air then starts the engine in the reverse direction. Running out of compressed air can result a "no more maneuvers left" situation so you better get it tied up without to much fooling around The exposed rockers and push rods must be lubed every watch (4 hours). Those "old "stamp mills" are much more pleasant too be around than the high speed Cats and Jimmys but a real pain to run.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"