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.

2024年12月17日 · At a length of 60 feet, 8 ½ inches over couplers, the model was more than five feet longer than its four-axle counterpart. A single locomotive could haul a 5,500-ton train on level track, climb grades as high as 5%, and negotiate curves of 23 degrees. The SD7 also featured another unique trait, EMD's own Flexicoil truck.

EMD SD7 Data Sheet

Utilizing a 1,500 hp engine and a longer underframe than the GP-7, the SD-7 was the first locomotive to use EMD's Flexicoil truck. Built by EMD between 1954 and 1959, the SD-9 6-axle road switchers produced 1,750 HP and were used primarily for freight service throughout the US, both on main and secondary lines.

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 …

Starting in 1979 the SD7's were sent to Sacramento Locomotive Works to be rebuilt into SD7R's, and emerged as 1500 - 1542. There is a persistent rumour that: "SP decreed no road-switcher over 1600hp was to get the Black Widow paint scheme" - photo's in 'Southern Pacific Historic Diesels Vol.4 SD7's and SD9's by Joe Strapac' puts lie to that...

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.

This loco was built in 9/1953 with EMD construction number 18398. It was built as a reserve passenger engine with steam generator and twin 1200 gallon tanks, one for diesel fuel and one for boiler water. It was painted in standard for the "tiger stripe" colors and was delivered with barrel oscillating and twin sealed beam headlights at each end.

The SD7 was General Motors Electro-Motive Division’s first foray into 6-axle power. The “SD” stood for Special Duty, while the 7 was carried over for the 4-axle GP7 series. This new series of locomotives provided extra tractive effort spread and weight distribution across the six-axle trucks.

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 * Factory-Installed Sound & DCC Sound can be operated ...