The Vanguard was introduced just before the first of the large jet-powered airliners, and was largely ignored by the market. Only 44 were built, ordered by Trans-Canada Air Lines (TCA) and British European Airways (BEA). \u00a0 \nAfter only about 10 years\u0027 service TCA experimentally converted one of its Vanguards to a freighter configuration, calling it the Cargoliner. This was considered successful, and in the early 1970s most were converted to freighters, those from BEA becoming the Merchantman. These freighters remained in service for many years, with the last one not retiring until 1996. \u00a0 \nFor more information on design, operational history and variants, click here.