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.
4-6-4
From 1921, 58 C28 class express passenger tank locomotives were built for the "Java Staatsspoorwegen" by three German manufacturers, Henschel & Son, Sächsische Maschinenfabrik and Maschinenfabrik Esslingen. The C28 class was one of the most popular in Indonesia, achieving speeds of up to . It was declared the world's fastest steam locomotive on gauge when it achieved . In addition, being a tank locomotive, it was able to travel at full speed in both directions.