The Prima Diesel-electric locomotives are a class of medium and heavy, four- and six-axle, passenger and freight mainline locomotives. They have been built both to 1,435 mm (4 ft 8+1⁄2 in) standard and 1,668 mm (5 ft 5+21⁄32 in) broad gauges, and find use in the Middle East, Europe and North America. Alstom is the primary designer in cooperation with both General Motors (now EMD) and Siemens.