page_title: Trolleybus
section_title: Advantages
hierarchical_section_title: Trolleybus / Advantages
caption_attribution_description: Français&#160;: Irisbus Cristalis ETB 12 n°115 sur la ligne 2 du réseau TCL de Limoges, à Place Carnot.
context_page_description: 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.
  Currently, around 300 trolleybus systems are in operation, in cities and towns in 43 countries. All together, more than 800 trolleybus systems have existed, but not more than about 400 concurrently.
caption: Irisbus Cristalis trolleybus in Limoges, France
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