Help with wiring bus

My last layout was a good design. Let me think a moment how to condense and write how I did mine. Keep in mind this was HO Scale with Super Chief DCC and 5 separate 15 amp terminals with 12 pairs of screws each.

The Super chief sat in one corner. Two 10 gauge wires went to one Power distribution terminal. That was my main bus. One blue wire (South Rail) and one white wire, north rail.

My layout was a 12 x 8 rectangle. EACH wall of the rectangle received ONE Power Distribution board.

Each of the 4 PDB (Power Distribution Boards) ran a 10 gauge blue/white wire back to the PDB at the Super Chief's location.

Care was taken to only have a stub pair of wires. Never looping anything back to the DCC stand.

Now.

In each of the rectangle sections, all track was wired TO the PDB with 14 gauge feeder wires. Color was Black/Red.

There was NO spot anywhere on the layout where the Engines would be more than 3 feet from any feeder.

There was no more than (up to...) 12 feet-14 feet of run to any one Bus PDB.

Everything was protected by a GFCI Outlet at the wall, thence to short circuit detectors at each of the 5 PDB's And a Kiddie Commercial ABC (Has rating for electrical fires that home ones did not) on the wall.

The switches received a independent power matrix and it's own color wires (Green/Yellow) and the signalling also it's own wire etc.

Everything was separated so that a short anywhere on the entire railroad will be limited in many ways in it's impact.

I plan to do the same with my early construction pending final planning... (Final, final, revised final, torn up and thrown away final... etc)

I hope this helps, I am hoping you are still with us having glazed eyes reading this dry stuff.