The history of the trolleybus dates back to 29 April 1882, when Dr. Ernst Werner von Siemens ran his "Elektromote" in a Berlin suburb. This experimental demonstration continued until 13 June 1882, after which there was little progress in Europe, although separate experiments were conducted in the USA. The next development was when Lombard Gérin operated an experimental line at the Paris Exhibition of 1900 after four years of trials. Max Schiemann made the biggest step when on 10 July 1901 the world's first passenger-carrying trolleybus operated at Bielathal (near Dresden) in Germany. Schiemann built and operated the Bielathal system, and is credited with developing the under-running trolley current collection system, with two horizontally parallel overhead wires and rigid trolleypoles spring-loaded to hold them up to the wires. Although the Bielathal system only operated until 1904, Schiemann had developed what is now recognised as the standard trolleybus current collection system. In the early days, however, there were a few different methods of current collection being developed. The Cedes-Stoll system, designed by Carl Stoll, was once operated near Dresden between 1902 and 1904, and in Vienna. The Lloyd-Köhler or Bremen system was tried out in Bremen, and the Filovia was demonstrated near Milan.
Leeds and Bradford became the first cities to operate passenger-carrying trolleybuses in the UK on 20 June 1911. Bradford was also the last to operate trolleybuses in the UK, the system closing on 26 March 1972. The last rear entrance trolleybus in Britain was also in Bradford and is now owned by the Bradford Trolleybus Association. Birmingham was the first to replace a tram route with trolleybuses, while Wolverhampton under the direction of Charles Owen Silvers was responsible for turning the "trackless tram" into the trolleybus. There were 50 trolleybus operations in the UK in total, London's being the largest. By the time trolleybuses arrived in Britain in 1911, the Schiemann system was well established and was the most common, although the short-lived Stockport operation used the Lloyd-Kölher system and Keighley used the Cedes-Stoll system.
In the USA, some cities, led by the Brooklyn-Manhattan Transit Corporation (BMT—New York), subscribed to the all-four concept of using buses, trolleybuses, trams (in U.S. called streetcars, trolleys or light rail) and rapid transit subway and/or elevated lines (metros), as appropriate, for routes ranging from lightly-used to the heaviest trunk line. Buses and trolleybuses in particular were seen as entry systems that could later be upgraded to rail as appropriate. Although the BMT in Brooklyn built only one trolleybus line, other cities, notably San Francisco, California and Philadelphia, Pennsylvania, built larger systems and still maintain "all-four". If one includes cable cars as another mode, San Francisco could be called "all-five," as its cable cars provide general transportation as well as being a tourist attraction.
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