EMD SW7

EMD SW7
Baltimore and Ohio No. 9624 TR4 cow-calf set at Riverside Yard, Baltimore, in 1969
Type and origin
Power typeDiesel-electric
BuilderGeneral Motors Electro-Motive Division (EMD)
ModelSW7, TR4
Build dateOctober 1949 – January 1951
Total producedSW7: 489
TR4: 15 sets
Specifications
Configuration:
​
 • AARB-B
 • UICBo′Bo′
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Prime moverEMD 12-567BA[1]
Engine typeV12 diesel
AspirationRoots-type supercharger
Cylinders12
Performance figures
Power output1,200 hp (895 kW)

The EMD SW7 was a diesel switcher locomotive built by General Motors Electro-Motive Division between October 1949 and January 1951.[2] It was powered by a 1,200 horsepower (895 kW)12-567A engine.[1] The SW7 replaced the earlier 1,000 horsepower NW2 switcher in EMD's catalog.[3] A total of 489 SW7 locomotives were produced. The majority of the SW7s were built by EMD Plant #3 in Cleveland, Ohio.[citation needed] In addition, 15 TR4 cow-calf paired sets were produced.[3]

SW7 production was discontinued in 1951 in favor of the new SW9.[2]

  1. ^ a b Solomon, Brian (August 2014). GE and EMD Locomotives: The Illustrated History. Voyageur Press. p. 231. ISBN 978-0-7603-4612-9.
  2. ^ a b Schafer, Mike (1998). Vintage diesel locomotives. Osceola, WI: Motorbooks International. p. 25. ISBN 0-7603-0507-2. OCLC 38738930.
  3. ^ a b Marre, Louis A. (1995). Diesel locomotives : the first 50 years : a guide to diesels built before 1972. Waukesha, WI: Kalmbach Pub. Co. pp. 30–31. ISBN 0-89024-258-5. OCLC 34531120.