This is from my head, during lunchtime (No Funnel Cakes here, so I might be way off!). Pullmor was the vulcanized rubber tread wheels (until late in production when ACG went to grooved wheels with "rubber bands." As was pointed out, the steamer motors went through a design change too, which is visible by looking at the armature. We nowadays call the variations "pre-pullmor" and "pullmor" because the change occured at the same time. I don't know if ACG ever used that designation. The difference is in the "core." If you look at a "pre" motor, the core has wider gaps between the poles, and you can see a lot of the windings, a "pullmor" motor, the gaps are much narrower, and you can't see much of the windings. A similar change happened to the diesel armatures too, but they have many more design variations, including field sizes. BTW, the steamer motors also have quite a few variations, but most of the oddball ones are rather scarce, including the DC armature. Bill's book covers the mechanical details, for some of us it is a really good read, and great reference. Others may be entirely bored by this all. . . . . S' David D. Where's the funnel cake???? Hmm, tuna salad and a peach. . . .
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