Good post, Jim. I know what you mean. Variations can drive you nuts. Just about everything in early Prewar Lionel is a variation. I think I've got a dozen different 800's, 801's, 820's, & 901's. Then there's the 700 series loco's - gold vents, not gold vents, cast iron wheels, die cast wheels, LL's, Mfg plate, pedestal headlight, and on and on. Sometimes you just have to step back and enjoy them for what they are, Toys.