Locomotive, Diesel, EMD SW7

History: The EMD SW7 is a 1,200 hp (895 kW), B-B switcher locomotive manufactured by General Motors Electro-Motive Division of La Grange, Illinois. The SW7 was manufactured from October 1949 to January 1951 and 489 were produced. The 1,200 hp (895 kW) was achieved by using a 12-cylinder, model 567A engine.
EMD also offered a cow-calf version of the SW7 known as the TR4; 15 TR4 cow-calf paired sets were produced.

The EMD SW7 debuted in October, 1949 and looked to follow the success of the previous SW1 and NW2 models, which combined, sold more than 1,800 units between 1939 and 1953. The SW7 used the traditional EMC/EMD carbody design, that was tapered near the cab and featured EMD's classic conical exhaust stacks above the hood. Length remained the same at just over 44-feet and it continued to use GM's model D37 traction motors. The biggest difference, to date, with the EMD SW7 over any previous model was simply horsepower. Also, by the time the SW7 was developed the "SW" designation EMC originally used, which stood for six-hundred horsepower, welded frame had long since been dropped with EMD simply having refer to "switcher."

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Railroad/Company: Electro-Motive Diesel (EMD) is an American manufacturer of diesel-electric locomotives, locomotive products and diesel engines for the rail industry. The company is owned by Caterpillar through its subsidiary Progress Rail Services Corporation.

Electro-Motive Diesel traces its roots to the Electro-Motive Engineering Corporation, a designer and marketer of gasoline-electric self-propelled rail cars founded in 1922 and later renamed Electro-Motive Company (EMC). In 1930, General Motors purchased Electro-Motive Company and the Winton Engine Co., combining the two to form its Electro-Motive Division (EMD) in 1941.

In 2005, GM sold EMD to Greenbriar Equity Group and Berkshire Partners, which formed Electro-Motive Diesel to facilitate the purchase. In 2010, Progress Rail Services completed the purchase of Electro-Motive Diesel from Greenbriar, Berkshire, and others.

EMD's headquarters, engineering facilities and parts manufacturing operations are based in McCook, Illinois, while its final locomotive assembly line is located in Muncie, Indiana. EMD also operates a traction motor maintenance, rebuild and overhaul facility in San Luis Potosí, Mexico.

As of 2008, EMD employed approximately 3,260 people, and in 2010 it held approximately 30 percent of the market for diesel-electric locomotives in North America.

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