DCC stands for Digital Command Control.

It is a system that allows model railways to independently operate multiple locomotives, functions (speed, sound, lighting, direction, movement) and accessories rather than control of sections of track. This is achieved by locating a decoder in the locomotive that listens to information in the track.

I have added a new section on analog and DCC operation in the newly released 3rd edition of my Model Train Help ebook.

Happy Railroading!