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.
Czech rail records
The fastest diesel rail vehicle
Locomotive T 499.0002 (759.002), nicknamed Cyclop, reached top speed 178 km/h on railway test circuit Velim (July 21, 1975)