High Quality Content by WIKIPEDIA articles! The Avro 691 Lancastrian was a British passenger and mail transport aircraft of the 1940s and 1950s developed from the Avro Lancaster heavy bomber. The Lancaster was named after Lancaster, Lancashire; a Lancastrian is an inhabitant of Lancashire. The Lancastrian was basically a modified Lancaster bomber without armour or armament and with the gun turrets replaced by streamlined metal fairings. The initial batch was converted directly from Lancasters; later batches were new builds. In 1943, Avro, through its wartime Victory Aircraft Canadian subsidiary, converted a Lancaster X bomber for civil transport duties with Trans-Canada Airlines . This conversion was a success resulting in eight additional Lancaster Xs being converted. The "specials" were powered by Packard-built Merlin 38 engines and featured a lengthened, streamlined nose and tail cone. Range was enhanced by two 400 gal Lancaster long-range fuel tanks fitted as standard in the bomb bay. These Lancastrians were used by TCA on its Montreal-Prestwick route.