SD45 is a type of diesel-electric locomotive built by the Electro-Motive Division of General Motors. Introduced in the late 1960s, it was designed for heavy freight service and is known for its powerful engine and reliability. The locomotive features a distinctive design with a long hood and a cab at one end, making it suitable for various railroads across North America. The SD45 is equipped with a 20-cylinder engine, which allows it to produce significant horsepower, making it capable of hauling large loads. Over the years, many railroads, including Union Pacific and Santa Fe, have utilized the SD45 in their fleets, contributing to its reputation as a workhorse in the rail industry.