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I reckon a "pin" is on the middle truck. The middile truck is connected to a inner truck. <br /> <br />I suspect the "outer" truck is pivoted off of the middle truck. Thus: the forward truck is like a engine pilot wheels, the middle the driving wheels (on a steam engine) and the trailing truck picks up the rest of the weight. <br /> <br />If I confused you Im sorry, could not find words to express.
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