LNER Class A4 4468 Mallard - Technical Specifications

Technical Specifications

Mallard was released into traffic for the first time on 3 March 1938. She was the first A4 to be fitted with a Kylchap double blast pipe from new. This was one of the factors that led to her selection for the attempt on the world rail speed record in the following July.

Mallard wore a variety of liveries throughout her 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 regaining her original LNER garter blue for preservation in 1963.

As with all 35 of the Gresley A4 pacific steam locomotives, Mallard was fitted with streamlined valances, or side skirting, when she was built. This was removed to ease maintenance in wartime, as it was on her sister engines. 4468 lost her valances during a works visit 13 June 1942, regaining them in preservation in 1963.

Mallard was fitted with twelve boilers during her 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, 5 March 1948), 8957 (from 60009 Union of South Africa, 16 September 1949), 29282 (from 60028 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 her career. She started off with a non-corridor tender in 1938, had corridor design tenders during her British Railways days and was fitted with a non-corridor tender in 1963 to recreate her original appearance. The tenders she 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).

Mallard was allocated to three sheds during her career: Doncaster, Grantham (transferring 21 October 1943) and Kings Cross ('Top Shed'), transferring on 11 April 1948.