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I thought that you were having a go at the French for a moment, but the DCC problem is easy to fix.
As has been said, the wiring has to be right with the polarity of the frog being set by the turnout motor preferably as the point blades move; then the biggie that I've encountered is back-to-back measurements of the wheel sets - also mentioned above.
A minor problem that I had was a curve that was too close to a straight point and it twisted the locos in a way that they touched the frog in the front and the point blade with the other polarity. It only affected a few locos, but it was really annoying. I solved this after a few months of hair-pulling, but just moving the straight point 10cm further along the track.
As has been said, the wiring has to be right with the polarity of the frog being set by the turnout motor preferably as the point blades move; then the biggie that I've encountered is back-to-back measurements of the wheel sets - also mentioned above.
A minor problem that I had was a curve that was too close to a straight point and it twisted the locos in a way that they touched the frog in the front and the point blade with the other polarity. It only affected a few locos, but it was really annoying. I solved this after a few months of hair-pulling, but just moving the straight point 10cm further along the track.
