April 9, 2024
PROTO 2000 Diesel EMD SD7 Electro Motive Division #991 Demonstrator
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For your bidding consideration...a Walthers Proto 2000 EMD SD7/9 Demonstrator #991 Comes with the detail parts I've not yet installed along with Kadee #158 Scale Couplers and will ship in original packing/box. Walthers MPN8 This model has been converted to DCC & Sound using a Tsunami Soundtraxx Decoder with enclosed high base speaker...TSU-AT1000 EMD 567 prime mover (1st generation, non-turbo charged) Walthers Published Features/Specs EMD SD7 is Model of First Special Duty Series Locomotive * Prototype-Specific Detailing * Magnetic Knuckle Couplers * All-Wheel Drive & Electrical Pick-Up * Dual Machined Brass Flywheels * Constant & Directional Headlights * RP-25 Wheels * Heavy Diecast Chassis * Five-Pole Skew-Wound Motor Originally intended for use on branch lines, EMD introduced its Special Duty series in 1952 with the SD7. This loco also introduced the three-axle Flexi-Coil truck with its powered center axle. This was a major departure from earlier three-axle designs where an unpowered center axle was used to spread the engine's weight over more wheels, reducing the strain on the lighter rail and lower capacity bridges found on branches. EMD's design not only spread the weight but the extra traction motors provided a bit more power to get trains started. The SD's longer trucks required a longer frame, and buyers could also
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