Same loco, one is from 36-37 and the later one is 38/39 ish. The 425 is later, it should have an E unit in the cab. Gregg, aka Northwoods Flyer will probably be along with more info, but that is generally it. The change in numbers would seem to match the move from Chicago to New Haven when AC Gilbert bought AF. Check out the catalogs loaded on the Eli Whitney AC Gilbert site, will be helpful as well.
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