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worker, I understand your explanation of the two derailment modes, but I am surprised that the retarder mode is a new discovery.  My question about flange wear concerned the tendancy for the flange-to-rail contact area to increase as the flange wears.  It would also be contributed to by rail wear.  In other words, the wear will bring the entire flange face into contact with the rail head rather than just the base fillet radius of the flange contacting the rail head.  And the action of the wheel rotation in this full flange contact will, in reaction to the rail, lift the wheel until the flange is able to ride over the top.
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