Bus Controller Grow with MRC's DCC Systems Now more versatility using MRC's Bus Controller. You can now control up to 20 trains and have 10 throttles at your fingertips in minutes. This unique and very inexpensive device links 2 Command 2000’s together with just six additional wires, no interfacing or complex connections. MRC has revolutionized the DCC industry with their Command 2000 system. Now with the introduction of the Bus Controller you can continue to grow with this system. You have more throttles and more locomotives without all the fuss. For those hobbyists, who wish to do so, MRC's Bus Controller will link to Digitrax, Lenz and many other DCC systems, which expands adaptability and utility of the MRC’s Command 2000. Using the Bus Controller requires a power booster. One more way MRC is keeping DCC Easy! Item # AD600 Retail: $19.98