Editing Trolleybus (section)

==Double-decker trolleybuses==
[[File:Tetley Bitter Advert on Bradford Trolleybus Cropped.jpg|thumb|A trolleybus in [[Bradford]] in 1970. The [[Trolleybuses in Bradford|Bradford Trolleybus system]] was the last one to operate in the United Kingdom; closing in 1972.]]

Since the end of 1997, no double-decker trolleybuses have been in service anywhere in the world, but, in the past, several manufacturers made such vehicles. Most builders of double-deck trolleybuses were in the United Kingdom, but there were a few, usually solitary, instances of such trolleybuses being built in other countries, including in Germany by [[Henschel & Son|Henschel]] (for Hamburg); in Italy, by [[Lancia]] (for Porto, Portugal); in Russia, by the Yaroslavl motor plant (for Moscow) and in Spain, by Maquitrans (for Barcelona).<ref name="Murray"/> British manufacturers of double-deck trolleybuses included [[Associated Equipment Company|AEC]], [[British United Traction|BUT]], [[Crossley Motors#Buses|Crossley]], [[Guy Motors|Guy]], [[Leyland Motors|Leyland]], [[Karrier#Trolleybuses|Karrier]], [[Sunbeam Commercial Vehicles|Sunbeam]] and others.<ref name="Murray"/>

In 2001, [[Citybus (Hong Kong)]] converted a [[Dennis Dragon]] (#701) into a [[Double-decker bus|double-decker]] trolleybus,<ref name="tm238hk">''Trolleybus Magazine'' No. 238 (July–August 2001), pp. 73 and 88.</ref> and it was tested on a 300-metre track in Wong Chuk Hang in that year.<ref name="tm238hk"/> Hong Kong decided not to build a trolleybus system, and the testing of this prototype did not lead to any further production of vehicles.