The EMD SD7 is a model of 6-axle diesel locomotive built by General Motors Electro-Motive Division between May 1951 and November 1953. It had an EMD 567B 16- cylinder engine producing 1,500 horsepower (1.12 MW) for its six traction motors.

The EMD SD9 is a model of diesel locomotive built by General Motors Electro-Motive Division between January 1954 and June 1959. An EMD 567C 16- cylinder engine generated 1,750 horsepower (1.30 MW). Externally similar to its predecessor, the SD7, the SD9 was built with the improved and much more maintainable 567C engine.

The SD7 is a model of 6-axle diesel locomotive built by General Motors Electro-Motive Division between May 1951 and November 1953. It had an EMD 567B 16-cylinder engine producing 1,500 horsepower (1.12 MW) for its six traction motors.

2024年12月17日 · Internally, the SD7 was identical to its four-axle counterpart, equipped with a 1,500 horsepower, 16-cylinder model 567B prime mover. However, it was also unique via a custom designed frame; by contrast, Alco and Baldwin had utilized the same basic frame in developing both their four, and six-axle models.

2023年5月16日 · The Electro-Motive Division’s original six-axle diesel-electric road switchers were the SD7 and SD9. Producing 1,500 and 1,750 hp, respectively, they set the stage for larger and more powerful six-axle locomotives that would come to dominate the industry. The first SDs sold in relatively small numbers.

2009年6月30日 · The Electromotive Division SD7 is a 6 axle, 1,500 HP diesel-electric locomotive built by EMD from 1952 to 1953. Like the 4 axle GP7, it uses a 16 cylinder 567B prime mover rated at 1,500 HP. The SD7 was the first 6 axle freight locomotive built by EMD. Prior to the SD7, the only 6 axle locomotives built by EMD were it's passenger E units.

SD7 diesels have their classification lights centered over each of their four numberboards, and mounted on an access door. All SD7s were built with high short-hoods. As EMD progressed at a rapid pace with new locomotive technology in the 1960s and 1970s, SD7s fell out of favor with a lot of Class I railroads as higher horsepower diesels were ...

Conrail inherited two SD-7's from the Penn Central, assigning them to 6998 and 6999. EMD's original Special Duty series "SD" locomotive was built between February 1952 and November 1953. The V-16 567B-powered units produced 1,500hp.

The GP7 was equipped with two three-axle bogies while maintaining the same engine power and the frame was lengthened, resulting in the SD7. The abbreviation stood for “Special Duty”, but is now interpreted as “Standard Duty” due to the widespread use of the SD series.

SD7: Southern Pacific 1518: EMD demo 990 (first SD) Illinois Railway Museum : Southern 197: Central of Georgia 201: Virginia Museum of Transportation : ... Korail 5025: Korean National Rwy 5025: Korea : Nevada Northern 204: Southern Pacific 5468: Nevada Northern RR Museum: Norfolk & Western 2349: