This book investigates the operational history and technical evolution of the London, Midland and Scottish Railway's steam locomotive fleet between 1923 and 1948. Drawing on extensive archival records and technical specifications, Casserley details the design, performance, and eventual withdrawal of these iconic machines. The work aims to provide a comprehensive overview of the LMS steam engine during a pivotal era of British railway development.

This book is recognized as a detailed and authoritative account of LMS steam locomotives, serving as a valuable resource for railway historians and enthusiasts. Its focus on the period between the Grouping of 1923 and nationalization in 1948 offers a specific and in-depth look at a significant era. The work is noted for its technical accuracy and comprehensive coverage of the subject matter.