Following the success of the first two rebuilt 'Claughton' class engines, the London Midland & Scottish Railway (LMS) in 1932 embarked upon a building programme of fifty more 'Patriot' class 5XP locomotives. The new 4-6-0 locomotives were at first referred to as 'Baby Scots', until officially named the 'Patriot' class in 1937. Two batches of the new 3 cylinder engines were built simultaneously, forty at Crewe and ten at Derby. In 1948 British Railways took all fifty-two 'Patriot' class engines into stock and subsequently eighteen of the class were rebuilt as '7P' locomotives. Although successful in traffic and popular with engine crews and enthusiasts alike, no example of these trains survived into preservation. This definitive work looks at the details associated with each member of the class and archive images of all fifty-two locomotives are featured. In addition to looking back this comprehensively researched and highly informative account of the LMS 'Patriot' class also details the plan to build the 53rd member of the class, to be known as locomotive No 45551 THE UNKNOWN WARRIOR.