I have two outer loops in my layout, and they are connected with two crossovers made up of two, each, Ross Regular 11 Degree crossover switches.
FYI, I have the commons of all of my transformers, including the right and left halves of my Lionel ZW wired together, and they are in phase.
These two loops are separated in to blocks between the two switches in each pair, such that one switch of each pair is in Loop-1 (Outer Loop), and the other switch of each pair is in Loop-2 (Inner Loop). The separation is created by the installation of an insulated pin at the center rail, only, between each switch. The outer rails are connected with metal pins.
The above is depicted in the attached pic of my layout, showing only the two loops.
The circles contain the switch pairs, and the red lines indicate the power block separations.
I am using DZ-1000 Switch Machines, and have these pairs of switches wired up to operate together so that I can operate both switches, in each pair, by throwing one actuator.
They are also wired up for Non-Derailing operation, on the straight thru lines only, as the turnouts are always set together, since both switches operate in tandem.
The above is depicted in the pic below.
When I had only Loop-1 powered up, these switches functioned perfectly.
I am using a dedicated, accessory, transformer to operate these switches, but they are powered thru track power, and again they are wired for Non-Derailing operation.
The problem came up, when I powered up the second loop.
The instant that I switch the power on for the second loop, the lights for the switch motors, and the actuators all go out, and the switches will not function.
I believe this to be a result of the pairs of switches being split over the two loops, and that they are confused but receiving power from two separate sources.
Is there any way that I can make this work?