FAQ:What is DCC?

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Main article: Introduction to DCC

DCC is an acronym for Digital Command Control. There have been various Command Control systems since 1946, the word Digital is used to differentiate DCC from the Analog Command Control systems in use. Digital Command Control uses a digital signal on the track at all times, unlike older analog systems which superimposed their signals on a Direct Current voltage. See the DCC History page for further information on Command Control systems.

It is a method for taking input from a throttle (think: train controller) and transferring it to a command station, which sends it out as a digital packet to the entire track layout. The locomotives on the track listen to all the digital packets, looking for their address. Once a locomotive sees a command addressed to it, it performs whatever function it's told to do - such as stop, speed up, slow down, turn lights/on and off, or turn on/off various engine sound effects.