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Published on Feb 19, 2007
Essen duobus switching between electric and diesel modes - seen in 1990 at the Viehofer Platz bus & tram stop which in 1991 was replaced by an extension to the underground / subway system - and for a while also served by kerb guided trolleybuses as well as trams.
More information on the 'dual-mode-bus' demonstration system which saw buses sharing part of the underground light rail system can be found here... http://citytransport.info/OBahn.htm