Fairbanks Morse 38 8-1/8 diesel engine
The Fairbanks-Morse 38 8-1/8 is a diesel engine of the two-stroke, opposed-piston type. It was developed in the 1930s, and was a licensed version of Germany's Junkers Jumo 205 aircraft diesel.
Source: Wikipedia — Fairbanks Morse 38 8-1/8 diesel engine (CC BY-SA 4.0)