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.

An SD7 is a 6-axle road switcher diesel-electric 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 for its six traction motors. 188 were built for United States railroads.

Dec 17, 2024 · The SD7 was the builder's first six-axle road-switcher that debuted in 1952, a few years after the GP7.

Other locos with this serial: CR 6999(SD7) TBER 6999(SD7) TRRA 1751(SD7R) ILSX 1751(SD7R) ILSX 1398(SD7R) Page Controls : View: Pics Per Page : ... seen : Description: TRRA 1751 : CR 6999 PC 6999 ; nee PRR 8589 Photo Date: 2/4/2006 Upload Date: 2/14/2008 4:37:30 PM : Location: Butler, WI : Author: Edward Weisensel: Categories: Locomotives: ILSX ...

CR SD7 6999 waits for assignment in it's last week in grimy black with former PRR N-5 cabin 19121R at Allentown yard. With permission. A rarity in Bethlehem as one of only two ex-PRR SD-7's shows fresh CR blue in July, 1979. These were the only two SD7s on Conrails roster.

May 16, 2023 · 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.

EMD SD7: Built As: PRR 8588 (SD7) Serial Number: 18669: Order No: 5300: Frame Number: 5300-1: Built: 10/1953: Notes: 10/1953, nee-PRR 8588: Other locos with this serial: PC 6998(SD7) CR 6998(SD7) PRR 8588(SD7) Page Controls : …

In Service: 1952 – early 80s; First unit (EMD Demonstrator #990, sold to SP in 1953, #5308; later #1518) preserved. Variations: Built with and without dynamic brakes; railroad-specific appliances. Primary Assignment: Local and branch-line freight.

Jul 25, 2010 · Examples of heavy SD7s were those bought by GN, B&LE, B&O, and PRR. Lightweight SD7s were bought by C&NW, and MILW. But even lightweight SD7s weighed more than their counterpart GP7s and so made better “heavy” switch engines.

Subsequent SD7 owners include those acquired through mergers, such as Burlington Northern (CB&Q, C&S, FW&D, GN), Chicago & North Western (M&STL) and Penn Central (PRR) and Conrail (PC). Others were sold and rebuilt, such as UP’s going to Illinois Central Gulf and becoming SD20s.