I am starting to do the computer control/LCC R&D.
I have concluded that the CAN bus style of control will not work for my outdoor setup.
The RC Circuits power hub only provides 1/2 amp on its power bus, while just ONE of my 3 searchlight poles consumes up to 2 amps!
Since my dead-rail engines require dependable WIFI coverage everywhere along the track, I have decided to use WIFI enabled arduino modules.
They're quite inexpensive and provide a lot of functionality in a small package.
This means my "bus" becomes a 2 wire 5v bus (with a LOT of amps).
It doesn't have to extend the length of the track, but only exist where controls are needed, ie. depots, freight yards, etc.
If I can't get 110V to a particular depot, I can park an Optima RedTop battery there for the season.
Hopefully the MKR1010 will provide adequate WIFI coverage with its internal antenna.
If not I can use a WIFI shield with one of the other arduinos.
I have a 24 channel PWM shield working now, enough control for 4 of the 3 searchlight towers, using only 4 bits of the arduino.
Its SPI based, and can be daisy-chained, so you could control 4/8/12 or more towers.
They also make an i2c bus based 12 channel PWM servo driver board, which I will be playing with to make tortoise style switch controllers.