A refinement of Electro-Motive designer Dick Dilworth?s GP7, the GP9 has proven more than equal to its designation as a General Purpose locomotive. For railroads strained by traffic demands, the ?geep? offered a truly bi-directional locomotive, equally at home in freight, passenger, or switching service, with greatly improved visibility over cab units. For EMD, this boxy 1750 horsepower road switcher offered lower construction cost and easier servicing. So enthusiastic were the nation?s railroads that over 3400 GP9s were constructed for 39 roads from 1954 to 1959. Perhaps the most lasting tribute to this remarkable locomotive is the number of GP9s that continue in daily service today, doing just what Mr. Dilworth intended. ? FACTORY INSTALLED QSI QUANTUM SYSTEM WITH DUAL SPEAKERS! ? Sound features in the A unit include: Dual Diesel Engine Sounds, Horn, Bell, Squealing Brakes, Doppler Effect, Air Let Off (in neutral), Headlight, Slave (mutes whistle and bell for double heading) ? Sound can be operated with a standard DC power pack as well as DCC controllers. ? Heavy diecast chassis and DC motor with 5 pole skew wound armature