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Here is an interesting thread with several different viewpoints on the subject: <a href="http://www.trainorders.com/discussion/read.php?2,392186">http://www.trainorders.com/discussion/read.php?2,392186</a> On one hand, I can see the logic of prohibiting paint on couplers to prevent it from hiding cracks if the coupler is painted after a crack occurs.   Otherwise, it does not seem like paint would hide a crack.  I heard that back in the days of cast iron wheels, trainmen might find a crack opened up and visible on a wheel that had been heated from braking.  However, once the wheels cooled, the crack would be invisible.  So they would stick some toothpicks into the crack.  That way, shop crews could find the crack and replace the wheelset.
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