@turkey_hollow_rr posted:I'll just add to Steve's reply by saying that as a DCS user I only segment the power rail, all commons are tied together. Careful, common and ground are not necessarily the same.
One issue with DCS is that the track and power feed from the transformer actually form a transmission line for the RF signal. That being the case, keeping the two feeds the same length has the potential of improving the signal quality to the track. How much of an improvement is pretty hard to quantify given all the other variables that enter the picture. However, given that fact, I did run power and ground to all my track drops, I figured it wouldn't hurt to try to keep the signals as clean as possible. I don't think it hurt anything, I have great DCS signals all around the layout. 
