Mainline steam trains in Great Britain
The most famous steam locomotive operating on the British main line is the 1923 built "Flying Scotsman". After being taken into public ownership in 2004, following a decade long refit it returned to mainline service in 2016. The fastest steam locomotive ever built, the 1938 built "Mallard", was also certified for main line operation briefly in the 1980s.
Coronation Scot
The streamlined Coronation Class locomotives were specially developed for the service, and were amongst the most powerful steam locomotives to operate on British railways. On a press run preparatory to the introduction of the service in June 1937, LMS Princess Coronation Class 6220 Coronation, newly built, achieved a speed of 114 miles per hour (183 km/h) near Crewe.