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Think of your power supply as a system, that has several components, all of which need to be operating well. You replaced the power pack, that's good. Next, I would use the N-track standard for power transmission. I used 10-12 guage automotive wire (get a roll of red and a roll of black). I'm not sure how your layout is designed, but run a red and black wire from one end to the other. This will become your "main bus". Use the same wire to hook-up to the power pack. I'm assuming you are not soldering your track joints, but with this method you don't have to. Next, use smaller wire (I use Bell Telephone wire in N-scale, you can use larger in HO) to run "power drops" to each section of track. Use the correct size drill bit, and drill a hole inbetween the ties, but on the outside of each rail. Feed the wire down through the hole, strip about 1/8" at the end, bend 90-degrees, then solder to the outside of the left & right rails. Below the layout, connect these power drop wires to the correct main bus wires. Do this all the way around the layout, about every 3-feet, or where-ever you break the track at a joint. Then see if things run much better. I suspect you did not solder your joints, and each joint makes the amount of resistance jump dramatically. Let us know how this works for you. Robert
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