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Not a dumb question at all! DC uses a varied voltage of 0-12V DC on the rails to control and power the train, DCC puts around 14-16V AC on the track constantly and uses coded instructions passed to decoders fitted in each loco to control the trains. DCC also allows you to have headlights that are constantly illuminated even when the train is stopped (as there's always power on the rails) and neat stuff like sound units and remote couplers. Hope this helps!
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