The BR Standard Class 3 is a type of steam locomotive designed by the British Railways in the early 1950s. It was part of a series of standard locomotives aimed at modernizing the British railway system. The Class 3 locomotives were built for mixed traffic duties, meaning they could haul both passenger and freight trains efficiently. These locomotives feature a 2-6-0 wheel arrangement, which provides a good balance of power and stability. A total of 127 units were produced, and they were known for their reliability and versatility. The BR Standard Class 3 played a significant role in the post-war era of British rail transport.