train hobbyists have a standard of digital controlvset up by the NMRA called DCC. See this thread - in particular Fergy's informed posts - for some details about it: DCC thread from ages ago
Car DCC was first talked about before the digital offerings of SCX, Scalextric and Carrera had hit the streets, and is tending to refer to open source independent digital projects with a hope to becoming a unifying standard,I think...
In some instances, and some projects, people were actually using train DCC tocontrolslot cars, but the term seems a bit more general now.
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