A V20 engine is a V engine with 20 cylinders. Engines of this number of cylinders are not common in automobiles, but this configuration is used in some diesel locomotives. For example, the 1960s diesel locomotive EMD SD45 diesel-electric locomotive is fitted with a 20-cylinder EMD 645E3 two-stroke engine. The engine name is based on the displacement of each cylinder in cubic inches. In this case, it is 645 cubic inches (10.6 L) for each of 20 cylinders for a total of 211 L. Power output is 3,600 horsepower (2.7 MW), net for traction, with the maximum gross power output being closer to 5,000 HP when operated in self-test mode, with the generated output being dissipated by resistors.