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This article concerns buses that can operate from two independent fuel sources. For other hybrid technologies, see Hybrid bus or Fuel cell bus
Boston Neoplan AN460LF dual-mode trolleybus, operating in diesel mode (with its trolley poles lowered)

A dual-mode bus is a bus that can run independently on power from two different sources, typically electricity from overhead lines (in a similar way to trolleybuses) or batteries, alternated with conventional fossil fuel (generally diesel fuel).

In contrast to other hybrid buses, dual-mode buses can run forever exclusively on their electric power source (wires). Several of the examples listed below involve the use of dual-mode buses to travel through a tunnel on electric overhead power.

Many modern trolleybuses are equipped with auxiliary propulsion systems, either using a small diesel engine or battery power, allowing movement away from the overhead wires, called "off-wire" movement, but such vehicles are generally not considered to be dual-mode buses if their off-wire capability is very limited. Examples include the fleet of about 300 trolleybuses in San Francisco[1] and the trolleybuses used on a 2005-opened system in Rome, Italy,[2] which are capable of running on battery power only for short distances or short periods of time before needing recharging. The Rome vehicles are powered from overhead trolley wires over most of the 11.5-km route and only use battery power on the 500-metre section closest to the city centre.[2]

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