This book investigates the operational history and technical specifications of the London, Midland and Scottish Railway (LMS) locomotives during the period of their formation and nationalization. It provides a detailed account of the locomotive designs, their development, and their service lives under the LMS banner. The work draws upon historical records and technical archives to present a comprehensive overview of this significant era in British railway engineering.

This work is recognized as a specialized historical account for railway enthusiasts and historians. Its focus on the technical and operational aspects of LMS locomotives suggests a detailed and data-rich presentation. The period covered, 1923-1948, represents a crucial phase in British railway history, making this book a valuable resource for understanding locomotive evolution during the Grouping and early nationalization eras.