I almost got to the end of the article I'll finish it latter when my head stops hurting, I'll also look through the traders sites see if anything is recommend sadly the Athearn paper work is not a lot of help. As my layout run's DCC its something I'll need to figure out, by the looks of it the new Genesis and the Athearn RTR locos fitted with LEDs all need a 21 pin chip even their reworked RTR SD40-2 is fitted with LED lights