A trolleybus is an electric bus that draws power from dual overhead wires using spring-loaded trolley poles. Two wires, and two trolley poles, are required to complete the electrical circuit. This differs from a tram or streetcar, which normally uses the track as the return path, needing only one wire and one pole. They are also distinct from other kinds of electric buses, which usually rely on batteries. Power is most commonly supplied as 600-volt direct current, but there are exceptions.
The Boston-area trolleybussystem forms part of the public transportation network serving Greater Boston in the U.S. state of Massachusetts. It opened on April 11, 1936, and since 1964 has been operated by the Massachusetts Bay Transportation Authority (MBTA). The current system consists of the Silver Line (Waterfront), located in the city of Boston. Prior to 1964, several additional trolleybus lines were in operation in Greater Boston, including a group of routes in and around Cambridge, outside Boston proper, that comprised the metropolitan area's only trolleybus service during the period 1964–2004. Measured by fleet size, the system was the third-largest trolleybus system in the United States at its peak, with only the Chicago and Atlanta systems having more trolleybuses than Boston's 463.
Guided Light Transit is the name of guided bus technology and associated infrastructure designed and manufactured by Bombardier Transportation(Now Alstom). It has been installed in two French cities: Nancy and Caen. As of 2018, only the Nancy system is in operation; the Caen system has been abandoned and now rebuilt as a conventional tramway by 2019.
The Caen guided light transit or Caen TVR, locally known as "the Tram", was an electrically powered guided bus system in Caen, France, which uses Bombardier Guided Light Transit technology.
Trolleybuses in Wellington were part of the Wellington public transport system from 1924 until 1932 and again from 1949 until 2017. It was the last trolleybus system operating commercially in Oceania and the last major system operating in a country where driving is on the left side of the road.
A rubber-tyred tram is a development of the guided bus in which a vehicle is guided by a fixed rail in the road surface and draws current from overhead electric wires.
The Nancy Guided Light Transit or TVR is a guided bus system in Nancy, France. The system uses Bombardier's TVR technology. The TVR replaced the trolleybus system in Nancy.
The Lausanne trolleybus system forms part of the public transport network of Lausanne, in the canton of Vaud, Switzerland. The system has been in operation since 1932 and is the third-oldest surviving trolleybus system in the world, after those of Shanghai and Philadelphia.
The Ashgabat trolleybus system formed part of the public transport network in Ashgabat, the capital city of Turkmenistan. It was the only trolleybus system ever in that country.
The Santos trolleybus system forms part of the public transport network in Santos, a municipality in the state of São Paulo, Brazil. Opened on 12 August 1963, it presently comprises only one line, and, along with the two São Paulo metropolitan area trolleybus systems, is one of only three trolleybus systems still operating in Brazil.
The Fribourg trolleybus system forms part of the public transport network in Fribourg, capital of the canton of Fribourg, Switzerland. The system also serves the neighbouring municipalities of Villars-sur-Glâne and Givisiez, using one line in each case.
Louis Lombard-Gérin was French engineer involved in pioneering the trolley bus.
Franche-Comté 
Media related to Trolleybuses in France at Wikimedia Commons
