Suggestion:
Run the low voltage wiring UNDER the track roadbed so, when you weed or “garden” your layout you won’t dig up, cut, or hazard your wiring.
In some sections, I have used the standard schedule 40 PVC pipe to protect the wiring.
As to the switches, simply eliminate some of the wires. My Intermatic low voltage wiring has been in ground for 13 years - no problems.
Wendell
Wendell