Don, DCS can be engine specific and PS-3 can compound and effect other engines if the wiring internal is interfering with DCS signal transformer. Since half your fleet has problems, you need to make sure the ones not working have clean wheels and good pickups. Along with good charged batteries or BCR.
You may have a TIU that has sensitivity issues, but if your getting 10 all across the layout with a single engine chances are the TIU and track are fine. If you add a Lionel engine or certain passenger cars or maybe even a PS-3 engine with issues it could kill the signal. G
