OK
Jerome. I promised pictures and here they are. First a little background. As a lone operator who mainly does switching, Nothing is too complicated. As I may have said, I am strictly a DC person. I have two power supplies, a fixed MRC unit and a walk around memory throttle from an unknown manufacturer, name plate rubbed off years ago. On each of my two levels I have a main center comprised of a bunch of Atlas Selectors ganged together. I don't need a track diagram due to the walk around and the fact that I use well marked ground throws in all but a very few remote locations. No track on my layout is more than a 30" reach in.
Upper Level.
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Lower Level.
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Not all of the terminals are connected on the left because I went with a different configuration and have not removed the Selector.
The upper one is currently only connected to the walk around throttle. Occasionally my grandsons run trains on the lower level with the fixed throttle while I run on the upper with the walk around. They aren't tall enough to see the upper level yet.
Over on the north (trackwise) staging yard, I use Atlas Connectors which just turn track power off and on, all coming from a single terminal on the selector.
View attachment 114062
I originally had a row of Selectors there but decided that it was overkill, hence the mismatched cut out that hasn't been fixed. 12 staging tracks on the lower level only.
On the south (trackwise) end of the layout, I also use Connectors for those staging yards. Actually they both are set up as classification yards, stub ended on the lower level and double ended on the upper level.
Lower Level.
View attachment 114063
Upper Level.
View attachment 114064
This one was also previously a Selector.
I only run power wires through the components, all common wires come from a common buss.
I use 18 gauge stranded wire to get to almost all areas of the layout, with the final feed to everything from there being either 22 or 24 gauge wire, rarely over 12". Some is solid salvaged telephone cables and some is stranded salvaged computer wiring. I got a lot of both when our company installed wifi instead of the hard wired stuff.
It is a primitive, simple, yet effective system. Everything is in the on position unless there is a train parked on the tracks. As you can see, there are currently 56 blocks, with a few spares for the two undeveloped parts of the layout. With only two exceptions, industry spurs operate off their accompanying passing sidings. Those two exceptions are actually separate sidings with spurs. Engines are not parked on industry sidings.
If I was to ever go DCC, unlikely at best, it would just be a matter of replacing the existing DC power supply and turning
everything on. At 80+ engines, I can't really afford the time or money to convert, plus I would rather listen to music than a bunch of train noises.
Hope that this helps.