Number 4468 Mallard is a London and North Eastern Railway Class A4 4-6-2 Pacific steam locomotive built at Doncaster, England in 1938. It is historically significant as the holder of the world speed record for steam locomotives.
The A4 class was designed by Sir 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 (160 km/h), although in everyday service it was relatively uncommon for any steam hauled service in the UK to reach even 90 mph, much less 100. Mallard covered almost one and a half million miles (2.4 million km) before it was retired in 1963.


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