A wagon spotting appliance. It may be a "bogey" that is hauled backwards and forwards on a separate track installed between the main track rails by a winch. A forward pull on the bogey raises a pair of arms to engage in the wagon axle, and a reverse pull lowers the arms to enable the bogey to be drawn back under the next wagon ready for the next pull. Nelson Source: Dictionary of Mining, Mineral, and Related Terms
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