from the traditional chassis/body construction method. It was one of the first "integral" buses, with a combination of an "A" steel sub-frame (including engine, steering and front suspension) and a rear "B" steel sub-frame (carrying rear axle and suspension), connected by an aluminium body. The gearbox was mounted on the underside of the body structure with shafts to the engine and back axle. Later pre-war London trolleybuses, however, had previously adopted chassisless construction.

Prototypes

London Transport placed four prototype

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