How to wire a model train layout for Digital Command Control (DCC) part I: Boosters and circuit breakers By Jenny Freeland | November 20, 2009 | Last updated on November 7, 2022 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Having trouble viewing this video? Please visit our Video FAQ page Model Railroader managing editor David Popp show how to upgrade a layout using Zonemaster power supplies and Zoneshare circuit breakers.