The simplest way to wire up your inner loop is to make it a separate power district by insulating the center rail at your crossover. Then wire it to TIU fixed #2; using the B side of your Z-4000 to power fixed #2.
For you yard sidings you should toggle each one on and off using simple SPST toggle switches, or something like an Atlas #215 4 pole switch.
You have all the right tools at your disposal with the Z-4000 and the DCS system. It should work just fine.
If you email me at the address in my profile I can send you several wiring diagrams in .pdf format that will show you exactly what to do.
Rod
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