George, it is always good to organize the wiring and follow a standard. Those of us who are in S gauge and use Legacy have to make do with just 2 rails. The Legacy signal reception signal by the engine antenna is more reliable when the signal is on both rails. We do that by connecting a .1mfd 50V ceramic capacitor across the track power leads. It passes the Legacy signal but keeps the rails otherwise isolated. You could do the same with your control rail blocks if you find a need to improve the signal.