Great Northern #569 (Big Sky Blue)
Walthers Part # 920-47731, p. 40 Walthers 2008 HO Scale Reference
HO scale, $124.98, currently in stock at Walthers

 

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 specify a heavier frame for engines working transfers and other low speed service. Somewhat underpowered with only 1500 horsepower (same as a four-axle GP7), only 188 SD7s were built from February of 1952 through November of 1953; the more powerful SD9 was introduced the following January. EMD SD7s, Sound & DCC Equipped B&LE #452 B&LE #453 EMD Demonstrator #990 EMD Demonstrator #991 CNW #1661 CNW #1663 GN #561 GN #562 PRR #8588 PRR #8589 Chessie #1827 Chessie #1830 Undecorated EMD SD7s, Standard DC B&LE #451 B&LE #454 EMD Demonstrator #990 EMD Demonstrator #991 CNW #1660 CNW #1662 GN #569 GN #570 PRR #8588 PRR #8589 Chessie #1826 Chessie #1829 Undecorated

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