page_title: AEC Regent III RT
section_title: Prototype
hierarchical_section_title: AEC Regent III RT / Prototype
caption_attribution_description: English: AEC Regent III series 1 doubledecker
context_page_description: The AEC Regent III RT was one of the variants of the AEC Regent III. It was a double-decker bus produced jointly between AEC and London Transport. It was the standard red London bus in the 1950s and continued to outnumber the better-known Routemaster throughout the 1960s.
context_section_description: The prototype (London Transport RT 1) was built in 1938 with an AEC 8.8-litre (540 cu in) engine (a stopgap measure until the new 9.6-litre (590 cu in) was available) and air-operated pre-selective gearbox. Finding a satisfactory British substitute for the German air compressor, bought from Bosch, was to cause problems for AEC once war broke out. A prototype chassis was placed into service, disguised as an old vehicle. It carried a secondhand open-staircase body previously carried on Leyland Titan (fleet number TD 111), dating from 1931. Thus bodied, RT 1 entered service in July 1938 as ST 1140, even though it was nothing like a standard ST vehicle. It continued in service until December 1938.
  While the chassis was on trial, a new body was constructed at London Transport's Chiswick Works. Its four-bay body resembled that of the Roe Leeds City Pullman body exhibited at the 1937 Commercial Motor Show, though the overall impression of modern design and the features included marked a big step forward. This body replaced the old one on RT 1 and the bus re-entered service in 1939.
caption: The solitary pre-war RT-type built for provincial market. It was operated by Glasgow Corporation. (AEC brochure 1947)
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