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DCC needs gaps in the rails for for reversing sections or you will still have the same problem as you do with basic DC control. When the rails swing back around and join the opposing rail, you create a short. In DCC you wire in an automatic reversing unit and it takes care of this automaticly upon detecting the short caused by the train spanning the gap. What DCC elimitates is the gaps and miles of wire needed to wire a layout for blocks for multiple cab control. For any given layout, using common rail return on cab control, to any given section of track, You need your negative common wire. Then one wire for each cab on your layout. If you have four power packs, that means you have 5 wires to the same section of Track. With DCC it cuts that down to two. DCC also eliminates all the toggle switch thowing for switching blocks over to the cab your using. I am converting my layout over to the Digitrax system and am astounded with the amount of wire I am removing. James.
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