When I was at the St Louis assembly plant, the roller had a concentric (smooth) left end and an eccentric (‘Belgian block”)right end. So, the driver checked for ride on the flat side, and squeaks & rattles on the bumpy side. The time on the rollers was pretty brief - way less than 1/8 mile on odometer. Most of the miles were added in traveling out to the OK car lot, and then on to loading on transport.
That’s my recollection - Keith?
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