I'm shaking my head in disbelief or dumbness on my part. I had a decoupling track located immediately off the straight section of the switch. It was a siding so I put the decoupling track immediately off the switch, entering into a siding so I could decouple cars using the decoupling track and leave them on the siding. Listening to you guys point out a possible roller problem, I ran the SD70 and a Doodlebug from the siding, across the decoupling track, and onto the switch. Both engines stalled (powered down) when the front roller was just off the frog and crossing the silver rail of the incoming curved portion of the switch. That short section of silver rail doesn't have any power by design, I believe. Just so happens when the front roller was over that non-powered section of the switch the rear roller was directly over the decoupling track center actuation "button", which is also not powered. At that point neither roller was getting power. I removed the decoupling track and engines run perfect. Who would have thought!
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