The BR Standard Class 9F 2-10-0 is a class of steam locomotive designed for British Railways by Robert Riddles. The Class 9F was the last in a series of standardised locomotive classes designed for British Railways during the 1950s. It was intended for use on fast, heavy freight trains over long distances. It was one of the most powerful steam locomotive types ever constructed in Britain, and successfully performed its intended duties. The class earned a nickname of 'Spaceships', due to its size and shape. They were numbered 92000–92250.