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: 30
Specifications
Configuration:
​
 • AARB-B
 • UICBo′Bo′
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Prime moverEMD 12-567BA
Engine typeV12 diesel
AspirationRoots-type blower
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. It was powered by a 1,200 horsepower (895 kW)12-567A engine. The SW7 replaced the earlier 1,000 horsepower NW2 switcher in EMD's catalog. A total of 489 SW7 locomotives were produced. The majority of the SW7s were built by EMD Plant #3 in Cleveland, Ohio. In addition, 30 TR4 cow–calf paired sets were produced.

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

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