No photos available pre-fixing. Front drivers simply set themselves off, to the left in my case, and kept rolling till a short stopped the action and triggered shut-down. Except at that switch, where the derailment was immediately severe with instant stop. Pilot truck was sporadic and I didn't wait long to add the washer shim to fix that. Hard to know about some of these thoughts; folks more knowledgeable about production variations (castings for instance as mentioned above) might have thoughts. For me, most interested in finding others who have had the problem, especially others who have found their own successful fix. A matter of curiosity for me at this point. Plan to pull some long freight drags as the loco is intended to do here, and we'll see if the fix is bullet-proof or not. Likely, the weight transfer off of the traction tires will have reduced maximum pulling power in a straight line, in return for staying on the rails. Will report 
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