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We actually do not solder anything on the club layout except for track drops and inside control panels.
All wires drop to spade lugs and a small terminal block.
20 Gauge solid wire for soldering to rails.
16 gauge to module buss, 18-guage for main bus from boosters around the layout.
Our section (module) count is 46. ( some city sections do not have mainline track)
NO issues with power anywhere on the layout.
Likely because each section is 4-8 feet long, and 18 gauge between sections.