I don't know, they are all pretty neat. I'll mess this up and say my favorite 3/16ths scale AF engine's are my prewar 559 K5 Pacific, and 806 4-8-4 Challenger. Most of my AF engines are basket cases, but I do have running 312 and 322 engines both of which I do like a good bit. Here is the old 559, it should look really familiar to anyone with a 312.
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