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It sounds like your problem is voltaage drop due to running your current through the rail only. Every rail joint has resistence that drops your power. I'm running a double track loop around a 10' X20' room with a 10 track yard included on on DCC 5 amp booster. You need to run a bus of 10 or 12 guge wire under the layout along your trackage. Every 4 to 6 feet run feeder wire fom this heavy bus wire to the track above. This feeder wire can be lighter guage like 16 or 18, just keep these as short as possible.
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