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A trolleybus is an electric bus that draws its electricity from overhead wires using spring-loaded trolley poles. Two wires and poles are required to complete the electrical circuit. Trolleybuses can optionally be equipped either with limited off-wire capability—a small diesel engine or battery pack—for auxiliary or emergency use only, or full dual-mode capability. A simple auxiliary power unit can allow a trolleybus to get around a route blockage or can reduce the amount (or complexity) of overhead wiring needed at operating garages (depots). This capability has become increasingly common in newer trolleybuses.
Trolleybuses are used extensively in large European cities, such as Athens, Belgrade, Bratislava, Bucharest, Budapest, Kiev, Lyon, Milan, Minsk, Moscow, Riga, Saint Petersburg, Sofia, Varna and Zurich, as well as smaller ones such as Arnhem, Bergen, Brest (Belarus), Cluj-Napoca, Coimbra, Gdynia, Kaunas, Lausanne, Limoges, Luzern, Parma, Piatra Neamţ, Plzeň, Prešov, Salzburg, Solingen, Szeged, Tallinn and Yalta. Realising the advantages of these zero-emission vehicles, some cities have started to expand their systems again, while others, such as Lecce and Leeds, plan to introduce new trolleybus systems.
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