Introduced in February 1952 and produced through November 1953, the SD7 was the
1500HP six axle big brother to the GP7. Riding on six axles, three-motor trucks,
they were designed to offer more starting tractive effort in road service than
the GP7. EMDs introduction of an A1A freight locomotive led them to design the
SD7 from the ground up. In appearance, they are very similar to the GP7 only
with a longer hood. The radiators are grouped together at the end of the long
hood and not separated as was seen on the GP7. The grill assembly protrudes from
the side of the hood whereas with the GP7 the grills are fit flush with the
hood. As built, the SD7 very closely resembles the SD9 with the visual spotting
features being the boarding steps and a variation of the classification lights.
The SD7 (for Special Duty) was a massive locomotive at 60 feet 8 inches from
coupler to coupler and weighing 360,000 pounds. It was powered by the same
reliable 1500HP 567B V-16 two-cycle diesel engine as the GP7 and F7.
With a maximum speed range between 55 and 89 miles per hour, depending on the
gearing ratio selected, and a tractive force of 90,000 pounds, the SD series was
here to stay. With the SD7, EMD introduced the lightweight Flexicoil truck which
enabled these locomotives to be used on branchlines as well as for road service.
These trucks were so smooth that the SD7 was compared to riding in a luxury car.
With the advent of 1954, EMD made a conservative marketing push against the
competition with the announcement of their Nine Line series. This consisted of
the introduction of new locomotive model numbers, the SW9/1200, the F9A/B, the
GP9, and the SD9.
- NEW Paragon3 Sound & Operation System FEATURING ROLLING THUNDERTM with
Authentic Sounds and Prototypical Operation in both DC and DCC environments
- Factory Installed Engineer / Fireman Figures
- Locomotive Composition: ABS Body with Die Cast Chassis
- Couplers: (2) Operating Kadee or Compatible
- Compatible Tracks: Code 70, 83, 100 Rail
- Minimum Operating Radius: 18 in or greater
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