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Thanks for that link. It is an interesting reference that I had not seen. The AF engine in the publication is a postwar model. The 420, and 422, are prewar 1939 engines. There are differences in the component designs and wiring for the prewar three rail AF engines. Consider the reference as a guide, not as an exact match. For example, there is no smoke unit in a prewar engine and the reverse unit will be in the engine, not in the tender. For prewar AF I know just enough to be dangerous, hopefully a prewar collector can add to this topic.

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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