Thank-you for that info. Right now I am building my second layout, a 10' x 6' shelf layout, 24 inches wide, this is all the room my wife would give. I will also have a 18" x 48" movable staging yard on wheels. I am looking for a used Digitrax Zephyr System to start out with. My Proto 2000 GP7's, GP9's were purchased DCC ready. My SW1200 were not. All of my motive power is Proto 2000 in TH&B colors.