BR standard class 7 70000 Britannia steam locomotive. Built in 1951, it was the first British Railways standard locomotive to be built and the first of 55 locomotives of the Britannia class. It was initially based at Stratford in order to work East Anglian expresses to Norwich and Great Yarmouth, but was also particularly associated with the Hook Continental boat train to Harwich. It pulled the funeral train of King George VI from King's Lynn to London following his death in February 1952. It was withdrawn from service in 1966 after 15 years of service. Britannia made its return to the main line on 27 July 1991, successfully working enthusiast trips until 1997, and was featured in an episode of 'London's Burning'. After further restoration it returned to main line operational condition in 2011 and in January 2012 the loco hauled the Royal Train with Prince Charles on board to Wakefield Kirkgate, where he rededicated the locomotive.
A technician adjusts the pressure relief safety valve.