EMD E7

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EMD E7
Pennsylvania Railroad E7A #5901 on display at the Railroad Museum of Pennsylvania in 2015.
Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division (EMD) Model E7 Build date February 1945 – April 1949 Total produced 428 A units, 82 B units
Specifications Configuration: ​  • AAR A1A-A1A Gauge 4 ft 8+1⁄2 in (1,435 mm) Wheel diameter 36 in (914 mm) Minimum curve 21° (274.37 ft or 83.63 m radius) Length 71 ft (22 m) Width 10 ft 6+1⁄2 in (3.213 m) Height 14 ft 11 in (4.55 m) Loco weight A unit: 315,000 lb (143,000 kg), B unit: 290,000 lb (130,000 kg) Fuel type Diesel Prime mover (2) EMD 12-567A RPM range 800 Engine type V12 Two-stroke diesel Aspiration Mechanical via Roots blower Displacement 6,804 cu in (111.50 L) each Generator (2) EMD D-4 Traction motors (4) GM D7 or D17 or D27 Cylinders (2) 12
Performance figures Maximum speed 85–117 mph (137–188 km/h) Power output 2,000 hp (1,491 kW) total Tractive effort 56,500 lbf (251,000 N) starting, 31,000 lbf (140,000 N) continuous
Career Locale United States Disposition One preserved on static display, remainder scrapped.

The E7 was a 2,000-horsepower (1,500 kW), A1A-A1A passenger train locomotive built by General Motors' Electro-Motive Division of La Grange, Illinois. 428 cab versions, or E7As, were built from February 1945 to April 1949; 82 booster E7Bs were built from March 1945 to July 1948. (Circa 1953 one more E7A was built by the Los Angeles General Shops of the Southern Pacific by rebuilding an E2A.) The 2,000 hp came from two 12 cylinder model 567A engines. Each engine drove its own electrical generator to power the two traction motors on one truck. The E7 was the eighth model in a line of passenger diesels of similar design known as EMD E-units, and it became the best selling E model upon its introduction.^[1]

In profile the front of the nose of an E7A was less slanted than on earlier EMD passenger locomotives, and the E7, E8, and E9 units have been nicknamed “bulldog nose” units. Some earlier units were called “shovel nose” units or “slant nose” units.