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I assume this may be because of the "asymmetrical" nature of steamers with one set of pickups in the loco and the second in the tender. ? The 2rail O Scale Weaver 0-6-0 only fails at one boundary after entering and exiting all other boundaries successfully, When it fails it's not obvious that either PSXXAR or entered PSX shorts (LEDs remain in normal config) and the loco sound stops (it has a keep alive). ?A Weaver 4-6-2 and diesels do not fail at any boundary. ?An earlier topic suggested that one wheel might touch both sides of a gaped rail - I will relook at this. ?Any other suggestions?
Background:
- Figure 8 with PSXXAR at one end, PSXAR at the other with a PSX protected block in between.

- Both PSXAR inputs connected to PSX input and NCE SB5 booster.
- all boundaries double gapped ?with 3/4" stagger as recommended by PSX
- turnouts are well beyond gaps
- loco wheels and track all recently cleaned

There are 2 things I would recommend you check, Jeremy.? First, make sure the PSX that is between the PSX-AR devices has had it's timing adjusted as recommended in the PSX-AR manual, so it waits and allows the PSX-AR to see the phase difference and do its job before it decides that there's a short and shuts down.??
If you have already done the above, then check the PSX-AR carefully at the solder joints on the small leads of Q1-Q8.? Look for a cracked solder joint or one that looks as if it did not wet properly.? Also look for damaged components between those transistors, as I experienced a damaged diode (part?1N4148)?that once carefully replaced, fixed a problem similar to what you are experiencing.? It's very tricky soldering on a board like that, so it might require replacement of the board.? Good luck!

John Swanson
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