Add me to the cap group. I have found that the sound, especially prime mover sound makes a world of difference when it comes to stalling and power interruptions. When the sound is off, everything runs around perfectly, but when it's on, it will depend upon the locomotive. My track is about as clean as it can possibly be and I still run a track cleaner around every so often, but my Atlas snap switches have plastic frogs, so no chance to wire them up as far as I know. So far, I have installed just a couple of KAs and they do make quite a difference. I don't know what Tim is thinking as far as implementing caps, but it can't come too soon for me.
I admire Alan's layout electronics, but for most of us, the expertise just isn't there.