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I've installed decoders in Rivarossi Cab-Forwards, and Big Boys, so if the Challengers and Hudsons are similar, it should be a breeze. To isolate the motor, you just need to remove all the old wires (they were probably black). Where they were attached to, is where you will be soldering the decoder wires. Don't solder anything to the frame. May I recommend getting one of John Eberle's bright white LED's for your headlight. They look like the real thing, and will nearly blind you! :-) Call John Eberle's DCC Headquarters for all your DCC needs. (877)531-5275 He is very nice, has great service, and has installed lots of decoders in Challengers.
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