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If an electric motor does not turn it is usually because it is not getting sufficient power. Assuning you have checked all internal wiring and wheel wipers the only thing left is the commutator. Dirt, grease or insufficient pressure on the brushes will cause intermittent operation. Put your naked loco on the track and take a meter reading across the motor. If you get a voltage then it's time to clean the commutator and adjust the brushes.
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