page_title: LNER Class A4 4468 Mallard
section_title: Technical specifications
hierarchical_section_title: LNER Class A4 4468 Mallard / Technical specifications
caption_attribution_description: The front of the &lt;a href="http://en.wikipedia.org/wiki/LNER_Class_A4_4468_Mallard"&gt;Mallard&lt;/a&gt;, the world record holder for speed for steam locomotives. Taken at the &lt;a href="http://www.nrm.org.uk"&gt;National Railway Museum&lt;/a&gt; in York.
context_page_description: London and North Eastern Railway locomotive number 4468, 22 and 60022, named Mallard is a Class A4 4-6-2 Pacific steam locomotive built at Doncaster Works, England in 1938. It is historically significant as the holder of the world speed record for steam locomotives at 126 mph.
  The A4 class was designed by Nigel Gresley to power high-speed streamlined trains. The wind-tunnel-tested, aerodynamic body and high power allowed the class to reach speeds of over 100 miles per hour, although in everyday service it rarely attained this speed. While in British Railways days regular steam-hauled rail services in the UK were officially limited to a 90 mph 'line speed', pre-war, the A4s had to run significantly above 90 mph just to keep schedule on trains such as the Silver Jubilee and The Coronation, with the engines reaching 100 mph on many occasions. Mallard covered almost one and a half million miles before it was retired in 1963.
  The locomotive is 70 ft long and weighs 165 tons, including the tender. It is painted LNER garter blue with red wheels and steel rims.
  Mallard is now part of the National Collection at the United Kingdom's National Railway Museum in York.
context_section_description: Mallard was released into traffic for the first time on 3 March 1938. It was the first A4 to be fitted with a Kylchap double blast pipe from new. This was one of the factors that led to its selection for the attempt on the world rail speed record in July of that year.
  Mallard wore a variety of liveries throughout its career. These were: garter blue as 4468, LNER wartime black from 13 June 1942, later wartime black with the tender marked as "NE" from 21 October 1943 as 22 with yellow small stencilled numbers, post-war garter blue with white and red lining from 5 March 1948 with stainless steel cabside number 22, British railways dark blue as 60022 from 16 September 1949, Brunswick green from 4 July 1952 and its original LNER garter blue for preservation in 1963.
  The A4 class was built with streamlined valances, or side skirting, but this was removed during the war to ease maintenance. Mallard lost its valances during a works visit 13 June 1942, regaining them in preservation in 1963.
  Mallard was fitted with twelve boilers during its 25-year career. These boilers were: 9024 (from construction), 8959 (from 4496 Golden Shuttle, 13 June 1942), 8907 (from 2511 Silver King, 1 August 1946), 8948 (from 31 Golden Plover, Walter K Whigham, 10 January 1951), 29301 (from 60019 Bittern, 4 July 1952), 29315 (from 60014 Silver Link, 23 April 1954), 29328 (new-build boiler, 7 June 1957), 29308 (from 60008 Dwight D. Eisenhower, 27 August 1958), 29310 (from 60009 Union of South Africa, 9 March 1960) and 27965 (from 60009 Union of South Africa, 10 August 1961).
  Mallard has had seven tenders throughout its career. It started off with a non-corridor tender in 1938, had corridor design tenders during its British Railways days and was fitted with a non-corridor tender in 1963 to recreate its original appearance. The tenders it has been fitted with are: 5642 (3 March 1938 – 14 March 1939), 5639 (5 May 1939 – 16 January 1948), 5323 (5 March 1948 – 12 March 1953), 5648 (12 March 1953 – 21 July 1958), 5330 (27 August 1958 – 30 May 1962), 5651 (30 May 1962 – 25 April 1963) and 5670 (current tender, masquerading as original tender 5642).
  The original non-corridor tender 5642 was later coupled to sister locomotive 60026 Miles Beevor when it was withdrawn on 21 December 1965 but later came into the possession of the A4 Preservation Society who had purchased this locomotive from the scrapyard to assist the restoration of classmate 4498 Sir Nigel Gresley. It was scrapped in 1973 as being surplus to requirements, by which time it had also donated parts to the restoration of A3 class locomotive 4472 Flying Scotsman, which had recently returned from America and was being restored at Derby Workshops.
  Mallard was allocated to three sheds during its career: Doncaster, transferring on 21 October 1943 to Grantham and on 11 April 1948 to Kings Cross Top Shed.
caption: Mallard front view
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