FAQ:Is DCC power AC?
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Short answer: No
Long answer: Digital Command Control uses a 100% digital signal on the rails, delivering both power and data in the same signal. The digital information is encoded in the time domain by pulse width, not amplitude. It is not superimposed on a DC or AC waveform, nor does it use a high frequency carrier.
Since the signal is completely digital, the NMRA Digital Command Control waveform is a square wave and thus, is not AC. It is not DC either as the phase between the rails alternates to deliver the commands to multifunction decoders installed in the locomotives.
Being digital, the signal has two states: On or Off.
For a full explanation,see: DCC Power