BR Diesel Locomotives in Preservation by Fred Kerr is a richly illustrated photographic history documenting the preservation of British Rail (BR) diesel locomotives after the decline of the steam era. The book begins with British Railways' 1954 Modernisation Plan, which introduced diesel traction through a pilot scheme to evaluate different engine, transmission, and body designs before large-scale production. It explains how, after the withdrawal of steam in 1968, many diesel locomotives were retired, while dedicated enthusiasts and preservation societies worked to save representative examples from almost every BR diesel class.

Fred Kerr provides detailed information on preserved locomotives operating across Britain's heritage railways, describing their service histories, restoration projects, maintenance, and current locations (as of December 2016). The book also highlights the tireless efforts of volunteers who restore and maintain these historic machines, ensuring they remain operational for future generations. Illustrated with 214 colour and black-and-white photographs, it offers an excellent visual record of preserved BR diesel locomotives and is an invaluable reference for railway enthusiasts, transport historians, preservation volunteers, photographers, and model railway hobbyists.