(of a device) Self-powered, such as by an electricmotor or an internal engine; not requiring external power, such as from a person or a horse.
2007, John W. Diers and Aaron Isaacs, Twin Cities by Trolley: The Streetcar Era in Minneapolis and St. Paul, University of Minnesota Press, ISBN 0-8166-4358-X, page 145,Around the same time, TCRT experimented with removing the motors on one of its older cars, turning it into an unpowered trailer that could be towed behind a powered car.
