Alan Arnold showed me a buss system that worked well for me. He told me to use 12 g wire but I used 10 g under the track. I ran 14 g wire leads from the buss to the track every 5 to 6 sections of track. Some a little closer if switches we're involved.
Some will argue that is not the right way to do it. But look at modular RR clubs. They do it that way and it works.
Have Fun.
Ron
