EMD GP40 DCC Sound Value Equipped Locomotive - SOO LINE #4603 - HO Scale. This DCC sound-equipped EMD GP40 Diesel includes our Sound Value SoundTraxx diesel sound package with prototypical prime mover, 3 air horns, and bell?all in polyphonic 16-bit sound. All-wheel drive and E-Z Mate Mark II couplers. Performs best on 18" radius curves or greater.