The product is a book titled "LNER Steam H C Casserley 1923 - 1948" which falls under the category of Narrow & Miniature Gauge railwayana. It focuses on the transportation collectables and collectables related to the LNER (London and North Eastern Railway) in the era between 1923 and 1948. This book is a valuable resource for collectors and enthusiasts of railway history, particularly those interested in the narrow and miniature gauge railways. With a focus on the LNER steam locomotives and the work of H C Casserley, this book offers a detailed insight into the railway operations during that period.