Home DCC Testrun GP18 after rebuild DCCVideos Testrun GP18 after rebuild 137 Turbo? At last the GP18 has made it’s way to te layout. Fitted with an wrong sound decoder, it should be a non-turbo version of the EMD 567 prime mover, the GP18 has made it’s first inches on my layout after more then ten years of collecting dust. RELATED ARTICLESMORE FROM AUTHOR Videos Steam at Old Pigweed Layout Mountain & tunnel DCC Put a DCC function decoder in a Bay Window Caboose