4468 Mallard was built at Doncaster in 1938. The A4 class was designed for the North-Eastern Railway by Sir Nigel Gresley to pull high speed express trains. Mallard remained in service until 1963 working the route between London and Edinburgh. Mallard is the holder of the record for the fastest steam train in the world at 125.88 MPH. This record was achieved on 3rd July 1938 on the Stoke bank section of the east coast line near Grantham. It was a risky business as a curve occurred in the line just beyond the Stoke bank and the engine needed to break heavily to ensure it remained on the rails, During this the engine overheated (a problem that had been foreseen) and the engine had to be removed from service for repairs. Mallard also took part in the 1948 Locomotive exchange trials when locos from different regions of the newly formed BR were trialed on routes they did not usually run. Mallard hauled a train from London Waterloo to Salisbury but failed following the run and was removed from the trial. Mallard also pulled the last Steam hailed flagship ‘Elizabethan’ express from London to Edinburgh on 8th September 1961.
In the 1980s the engine was restored to working order and after being used for a number of years for pulling railtours become part of the static collection at the National Railway Museum, firstly at York (till 2008) then at Shildon (2008-2010) and subsequently back at York.