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The cars were short for two reasons: first, because of the density of the ore; second because they were essentially custom-designed to fit in the dump chutes for the lake barges that carried the ore to the furnaces. A long string of these cars could be parked in the holding chutes and dumped all at the same time. It was common for these cars to operate in sets of four, called "miniquads." The cars were permanently coupled together with a drawbar instead of a knuckle coupler, and the set moved as one car.

Later,

K
 
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