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o-27 gauge is three rail. That means you need one wire from the power pack TO the middle rail and usually the outer rail.Your clip should only hold the two wires and make contact with the MIDDLE RAIL and EITHER of the outside rails.. your choice.Im assuming (Make an a.. ) that you have a standard track power clip that snaps onto the middle rail and the outer rail. A proper install of this clip will have it hanging out to the outside of the railroad with room to hang the wires from power pack into the clips.I have not touched my 027 power in 20+ years but I think you are dealing with a power pack that has two ternimals for two kinds of power. A pair should be marked TRACK POWER and another pair should be for accessories.I cannot remember if it is DC or AC recitified that drives the 027 train so I will stop here.I will tell you that a few moments of improper electricty will probably burn the motor out.Track configuration should not matter with three rail, I believe the middle rail is common for all including reverse loops and such.
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