In addition to number books you can use colored tape which is good when tracing a circuit at a distance with senior eyes.
I am rewiring a earlier job and 12 wire colors, numbered tape as Mike mentioned and colored tape are of great assistance.
In the above example, white tape indicates the yard tracks, orange, silver and green feed three different branch lines departing from the yard.
For intuitive understanding, I divided my around the wall layout into nine 22' +/- sections. Each section is numbered in a ten numeral grouping such as 20 to 29 or 50 to 59 and so on. So at a glance I know which group of wires go to which area of the layout.
One additional thought, I pre bore 1 1/8" chamfered wire management holes in all bench work cross members. Typically one continuous series of holes for each right of way. Some larger jobs can require up to a dozen holes in busy areas to accommodate all circuits.
Just makes servicing easier.
Also, consider prewiring your layout as much as possible before installing any decking, lessens the maneuvering around under the platform.
Sorry, the photo will not rotate properly.
Colored wire helps make sense of this diode matrix.
