The Class A4 Locomotive ‘Bittern’ was built in 1937 by the London North Eastern Railway Company, one of only 35 of its class to be built. He is sister to the famous ‘Mallard’, the fastest steam locomotive in the world. ‘Bittern’ spent her life operating from London to York, Newcastle and Edinburgh on the East Coast Main Line and in 2013 became, at the time, the fastest steam locomotive in preservation, reaching 90mph on three historic runs. 