DCS is MTH Digital Command System and is used for OGauge 3 rail. DCC is Digital Command Control and is used mostly in HO and N gauges. DCC is set by CV's. (with me having a terrible memory it is hard for me to use). CV is Control Variable. Here is the NMRA Definition - https://www.nmra.org/beginners...mand-control-and-dcc.
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