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Philadelphia's first trackless trolleys were supplied by the J. G. Brill Company in 1923. Brill was based in Philadelphia, but was one of the largest manufacturers of trolley "cars" (streetcars, or trams) in the world from the 1890s to the 1920s (last making streetcars in 1941), and produced trolley buses from 1921 to 1954. Philadelphia purchased more trolley buses from Brill than from any other manufacturer, a total of 133. However, vehicles were also purchased from other builders, most notably Marmon-Herrington (71 units) and AM General (110).