Nevermind...I thought you had a nice HO layout or something.
DCC is a little operating board you install in your engines that makes them run seperatly on the same tracks.
When you run 1 or more engines on one track, you need to install DCC's into them. You control them via remote, instead of the little black box you plug into the track. Usually you run your powered engine at the head, and your helpers are usually "dummies" which are engines that have no electronics in them.