We'll agree to disagree on this point Ricky. The JLC GG1 sideframes, for instance, are indeed swelling and bowing out because they are expanding, and then pieces are breaking off. I have an example in right now for repair, the sideframes are out at least a quarter of an inch and expanding. Unless your experts have examined all the failures, I can't imagine they can make an unequivocal statement that none of it is due to zinc pest.
I think you're forgetting all of this stuff is cast in China, usually in small subcontractor shops, and to assume there is no impurities getting into the castings is pretty bold, and totally unverifiable! Is there some other problem responsible for some of the failures? Sure that's possible, but that's certainly not an explanation of all the failures that have surfaced lately. I suspect zinc pest is alive and well simply because of the way the stuff is currently manufactured, not because we don't know how to eliminate it. It frequently costs more to do things right!
