I HAVE A LIFE LIKE F3A THAT HAS A CIRCUT BOARD IN SIDE OF THE UNIT AND NO INSTRUCTIONS. I HAVE INSTALLED BACHMANN DECODER :)DCC DECODERS ON TO MY ANTHERN ENGINES (BLUE BOX), BUT NOT ON A CIRCUT BOARD (NOT A PLUG IN). ON THE F3A BOARD THERE ARE X's ON THE CIRCUT STRIPS AND IN SMALL PRINT "CUT X FOR DCC". THERE ARE 3 OR 4 X's.. SHOULD I SLICE THE STRIP ON THE BOARD AND THEN INSTALL THE BACHMANN DCC DECODER WIREING HARNESS FOR THE DECODER??? JERRY :)