ThereÃ‚â€™s no missing a GP30Ã‚â€™s characteristic Ã‚â€œhump,Ã‚â€ which was developed at the GM Automotive Styling Center. As well as creating a more modern appearance, the design was a practical way to house air intakes for the central air system and dynamic brakes. Bachmann carries on the prototypeÃ‚â€™s innovative history by offering a new DCC sound-equipped model. Our exclusive Sound Value SoundTraxx diesel sound package includes prototypical prime mover, 3 air horns, and bellÃ‚â€”all in polyphonic 16-bit sound. This model also features all-wheel drive, operating headlight, and E-Z Mate Mark II couplers.