Twin Disc, Inc. designs, manufactures and distributes power transmission equipment for a wide range of applications, including marine, off-road vehicle and industrial. The company was founded in the 1920s to manufacture clutches for farm tractors. It is now a worldwide company with subsidiaries or sales offices in Asia, Europe, North America, Oceania, and South America. Twin Disc torque converters (formerly made under licence in the United Kingdom by Rolls-Royce) were fitted to the British Rail Class 125 diesel multiple units and some export diesel locomotives, e.g. NZR TR class.