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Dave
I recently attended Warley where I posed some questions re DCC. I learned that no special wiring was required to pointwork and all that was required for trackwork was two wires. One particular firm informed me that dropper wires were required every 3 feet along the length of the layout connected to a track bus. Another firm said this was unnecessary and two wires placed approx centre of layout will supply power. A special module was required for a return loop. With DCC you drive the trains and not the track.
Hope this helps
Jim
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