The BR Standard Class 9 is a type of steam locomotive designed by the British Railways in the 1950s. It was built primarily for mixed-traffic duties, meaning it could haul both passenger and freight trains efficiently. The design aimed to provide reliability and performance, featuring a 2-8-0 wheel arrangement. These locomotives were part of a larger series known as the BR Standard Class, which included various classes tailored for different purposes. The Class 9 locomotives were known for their robust construction and versatility, making them a valuable asset in the post-war British railway system.