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Black Square / Yellow Dot ....
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It was evidence of a inspection for the presence of a series of straight plate 33" wheels that were subject to fracture and had led to several bad derailments (a bad design). Cars that were inspected and did NOT have those wheels got the black square with a yellow dot. Cars that were inspected and DID have those wheels had a black square with a white dot. Cars with 36" wheels were not subject to the inspection but sometimes had the "all clear" black with yellow dot sticker anyway. <br /> <br />Dave H.
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