To run the trains on the layout, I have selected to go with a DCC system from Model Rectifier Corporation (MRC). I am using the firm's Prodigy Advanced 2 "Squared" system. Presently, I am just using the wired version of this system. The layout itself is not that big and it can be operated easily with tethered controllers. What I like about this system was the ease I had in setting it up right out of the box. Within a few minutes I was able to run DCC equipped locomotives on the layout.
The features I like about MRC's DCC system is that it offers both two and four digit addressing, 14-28/128 speed steps, programing on the main as well as on the program track, and offering both universal and advanced consisting. I really like the idea of having 28 accessory functions to control various lighting and sound effects.
I have established my layout to operate with two main power districts using circut breakers. There is a third circuit breaker to handle the wye portion of my layout.
Though DCC systems will technically work with just two wires attached to the track, I have used significantly more than this under my layout. I have run bus wires the length of both layout legs and dropped feeder wires from each section of track.