The EMD SD39 is a diesel-electric locomotive built by the Electro-Motive Division of General Motors. Introduced in the late 1960s, it features a 12-cylinder engine and is designed for heavy freight service. The SD39 is known for its reliability and versatility, making it suitable for various railroads across North America. With a power output of 2,500 horsepower, the SD39 can handle steep grades and heavy loads. It is part of the EMD SD series, which includes other models like the SD40 and SD45. The locomotive's robust design has allowed it to remain in service for decades.