The EMD Model 184A Diesel Engines for the USN subchaser program were built in the La Grange plant early in World War Two, in a portion of the factory which had been erected just for this program and was afterwards known as the "Navy Building". A product of Kettering's brilliant design team, the engine occupied just slightly more space than a modern kitchen refrigerator (the engine stood on end) and produced 1200 (yes, one thousand two hundred) horsepower. The designers pushed both the materials and the existing technology to the absolute limits in the production of these machines, which were very short lived between overhauls. They met the needs for which they were built, but left the scene quickly after the war ended. I know of only one that exists today, in the Southeastern US. It is complete and intact, but is privately owned, so I will not identify the owner here. Anyone knowing of any additional surviving engines, please add on to this discussion!
Compared with the similar HP range Packard M2500 PT boat engine (1350 to 1500 HP, a gasoline engine), only about 1/8th as many 184A diesel engines were built. Consequently the manuals for the 184A engines were printed in very small quantity and they are among the rarest of EMD publications. Only one was issued per subchaser, so total distribution was about half as many as the total number of engines built since each vessel had two engines. There was a beautiful operators manual with an embossed color cover similar in style to the early FT locomotive operators manuals, and there was also a large hard cover combined operators and maintenance manual which had a number of superbly detailed fold out drawings and exquisite cutaway color plates of the engine from above and the side. In almost four decades in the diesel engine business I have seen exactly ONE of each of them. I cannot guess what one would sell for in the collector market, as I have never seen one offered for sale. Both manuals clearly identify the Electro-Motive Division of General Motors in La Grange, Illinois as the builder of the engine, not Cleveland Diesel Engine Division (the former Winton Engine) or GM Diesel (which became Detroit Diesel after the war).
Any time you read a book or an article on the history of Electro-Motive you can get a pretty good idea whether the author has really done their homework by looking to see whether the EMD Model 184A is included in the list of engines they built.