The Britannia Class refers to a group of steam locomotives built for the British Railways in the 1950s. Designed by engineer Robert A. Riddles, these locomotives were intended for express passenger services and were known for their power and efficiency. The class consists of 55 engines, each featuring a 4-6-2 wheel arrangement, which is ideal for high-speed travel. These locomotives were named after the British Isles and were often used on prestigious routes. The Britannia Class played a significant role in the modernization of British railways, showcasing advancements in steam technology during their operational years.