EMD SW7

EMD SW7

Baltimore and Ohio No. 9624 TR4 cow-calf set at Riverside Yard, Baltimore, in 1969

Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division (EMD) Model SW7, TR4 Build date October 1949 – January 1951 Total produced SW7: 489 TR4: 15 sets

Specifications Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Prime mover EMD 567A Engine type V12 diesel Aspiration Roots-type supercharger Cylinders 12

Performance figures Power output 1,200 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 V12 567A engine developing 1,200 horsepower (895 kW). 489 SW7 locomotives were produced. The majority of the SW7s were built by EMD Plant #3 in Cleveland, Ohio. In addition, 15 TR4 cow-calf paired sets were produced.