Hello,
I've spent many years in model railroading.  I still run DC due to the large number of DC engines owned (going back to the 1940s).   I just purchased a DCC equipped GS4 and am curious as to the purpose of the dummy plugs included with the engine.   The directions show how to place the dummy plugs into the PC board, but there is no explanation as to why I should or should not use them.  Help!