Reply to "Is DCC high frequency AC or alternating DC based?"

My (non-technically edumacated) understanding is that the DCC system sends constant AC power to the track - usually around 14 volts - and then the control system sends a DC signal through the rails to tell the decoder what to do. The decoder then takes the AC power, converts it to DC, and then feeds it to the lights or motor etc. The constant power allows the headlight and sounds to continue even if the engine is stopped, unlike a traditional DC system where lights and sound stop when the engine stops because the throttle is set to zero.