Looking for the best DCC system to run G gauge layout. What system do you recommend? I am running some higher amperage units, such as the USA Trains twin engine GP-7 which requires a 10 amp system. Looking also for a decoder that will run control and sound. Layout is a double loop that measures 27' x 28' and has several switches. When you need that kind of amperage it gets very confusing as to what system will wok the best.