I certainly does, Ed. Thanks.
Isolate both rails between turnouts 1 & 2 and 1 & 3. [easy to do using 4 insulated rail joiners at #1]
Wire the entire turnout #1 and the Quarry rails at the point end of the turnout through a DPDT switch, OR a 2nd PSX-AR, to switch power according to the position of turnout #1... but the INPUT side of the switch should be to select power from the main reverse loop rails.
If turnouts 2 & 3 are of the power routing type, add an insulating joiner on the frog rails between them.
Then when a train flows through either 2 or 3 to get to/from the Quarry stub it will automatically be at the correct polarity to exit/enter from the main reverse loop. If 2 and 3 are set to bypass the Quarry it doesn't make any difference what polarity exists on turnout 1 or the Quarry stub.
A loco already in the Quarry or even in the process of entering/exiting via 1, 2 or 3 will see the polarity quickly flip if there is a polarity change of the main reversing loop. This should not interfere in any way.
You can still get short circuits, and derailments, if both turnouts of either desired path are not set up correctly before attempting to run a loco through it. But that is operator/engineer error.
---In WiringForDCC@..., <lehighman@...> wrote :
OK. A picture has been uploaded to the files section titled "Quarry wye.jpg" Hopefully this helps.