I know this is going to be sort of long winded, but I need to explain what I'm trying to accomplish with my layout. So PLEASE accept my apologies, and bear with me. I finally have gotten most of my track layout anchored down. My layout consists of a main layout bench, plus an upper level bench above that. My intention is to have a continuous loop completely around the room walls but still have a reversing situation without having to manually pick the engine up and move it to the opposite end of the rolling stock to go in the opposite direction. So I built 4 long inclines to go from the lower level to the upper level, 2 of those inclines are just to go over the lower track to either get from the lower level to the upper level or vise, versa. But the other 2 of those inclines create the reversing procedure, but does it the same way, by going from one level to the other, (but inclined in the opposite direction) with the main lower track running in between the 2 reversing inclines. Right at the moment my layout is strictly "D.C.". But guess what? The old Model Railroaders Joy (or Curse) of "I Can't Wait" just had to rear up it's head and jab me with it's pitchfork prongs and I just had to try out my new layout with my engines. The first thing that happened when I turned on the Power Pack, then advanced the throttle was that the power on light (on the Power Pack) wouldn't come on even at full throttle and my "GP-7" just sat there and looked at me like it was part of a Union, and had went on strike. No Matter what I did, I couldn't get the engine to run. I checked, re-checked, and triple checked and everything seemed to be ok. I had full voltage out of the terminals on the back of the power pack, but not on the rails. So I disconnected the wires from the track. "Voila", the power light came on. So I did more checking with a multi meter (both on DC Volts scale, and on the Ohms scale with the power removed). No Voltage on track on DC scale. On Ohms scale, it showed continuity between both rails no matter what the polarity. I finally disconnected the 2 tracks on each of the reversing inclines.  Guess what? my GP-7 hauled tail completely around the layout, without a problem except for a few bugs at certain points which I have corrected. So here is the question. Does anybody know what I need to do to eliminate the short circuit my reversing inclines create when they are connected as part of the layout? Many thanks in advance to any suggestions coming my way from all those who have been in the Model Railroading Empire.  The Old Prospector.