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Doug, That is exactly the explanation that I have heard.  Paint is specifically withheld from couplers and wheels so as to not obscure cracks.  Paint is not withheld due to the futility of trying to get paint to hold up on these items, or to save money.  If it were not for the safety issue, they would just spray paint the wheels and couplers as a matter of course.  Caterpillar paints the track plates and chains on their dozers despite the fact that the paint will wear off.
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