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I just bought a new RK Z1000 transformer to power my o-gauge engine. It was running fine for a few hours, but now it suddenly runs full speed with the transformer throttle in off. As soon as I plug in the transformer the train takes off. Any ideas as to what is wrong?
 

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Defective transformer. Perhaps the throttle knob is broken so that it isn't really engaging the rheostat?
 
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