I am working a layout design with a wye where the leg that I plan to gap and power with the auto-reverser will lead into a small yard and interchange that goes nowhere else and is not connected to the rest of the layout. If there is another engine working in the yard what will happen when the AR detects an engine coming through the gapped part of the wye and reverses the polarity?

I have attached an image of the plan with the planned isolation point highlighted.

I bought a used Walthers SW8 that had a QSI sound decoder in it.  Unfortunately it seems to have the problem that it won't stop unless the emergency stop is pressed.  And when pressed it only stops the engine, it doesn't actually shut it off.  Pressing momentum does not seem to do anything. The unit will decrease in speed to a slow pace, but won't actually stop when the power is zero. Have tried resetting the decoder on my NCE PowerCab on the test track and the results always seem to  be the same. Wondering if any DCC gurus have some ideas.

Hoping someone can shed some light on a DCC problem I'm having.  I have an used engine that I picked up and while it initially ran on a test track before being put away, it now doesn't run and I can't seem to get my NCE system to recognize it.  Several times I have gotten as far as it identifying a manufacturer number, but when I look this up in the NMRA table, that value doesn't actually correspond with anything known manufacturer.

I was recently given some old Shinohara code 83 turnouts from my model rr club. I believe these are power routing, they are pretty old. I'm not sure how to wire these turnouts, can anyone provide any instruction on how to install these on a DCC layout?

Thanks, Mark