The SD40-2 is a diesel-electric locomotive built by Electro-Motive Diesel (EMD) that was introduced in the early 1970s. It features a 3,000 horsepower (2,240 kW) engine and is known for its reliability and versatility in freight transport. The SD40-2 has a distinctive long hood and is widely recognized for its performance on various railroads throughout North America. It has become one of the most successful locomotives in EMD's history, with thousands produced and many still in service today.