I think you've nailed it. I'm not familiar with these turnouts, but I suspect they're "power routing." So, the power only goes to the track that the turnout is thrown for. By feeding only one of the tracks, you isolate that track when you throw the turnouts the other way.
Add feeders. Add lots of feeders. A set of feeders every 3-6 feet is not only not excessive, it's actually recommended. This will give you better, more reliable performance for the life of your railroad.
You don't need one of those "feeder tracks," by the way. You can solder feeder wires directly to the rails. Or, Atlas makes rail joiners with feeder wires attached. If you buy a package of those, you'll say, "I can make these myself. Why spend $2.79?" And, you'll have nailed that, too.
It takes an iron man to play with a toy iron horse.
fredswain wrote:Kato switches can be set up as power routing, non-power routing, and with powered or unpowered frogs. It's just a simple adjustment on the back...
I have Unitrack in HO and it appears that you have your turnouts set up for power routing.
Whether or not they can be changed to non-power routing depends on the turnouts. The powered #6's require a repositioning of a pinned connectors and can be set either way.
If you have powered #4's then you are out of luck. If they are manual, then you just have to change a couple of screws on the bottom of the turnout. I used manual #4s and then added the electric switch motors as I wanted non-power routed but with remote operations.
The instructions to change power or non are with the turnout packaging.
Put insulated joiners on the frog rails (Away from the points end) and install a feeder track to the passing (Runaround, siding whatever) and another to the mainline. Presto, power choking.. uhh.. routing defeated.