When it was originally published, Hugh Longworth''s definitive record of every steam locomotive operated by British Railways from nationalisation until the end of steam traction on the network in 1968 was very much welcomed as it provided for the first time in one place a detailed and accurate source of reference on this important subject. With the book having been out of print for some time, a new and revised edition was overdue. However, the extent of the revisions, which included the books'' many photographs being given more space on the page and the use of enlarged and enhanced locomotive drawings, greatly increased the size of the work. Rather than attempt to cut or dilute the content, it was decided that instead of publishing one unwieldy and expensive book, a more realistic approach was to present the work in two volumes of roughly similar size. This is the first of these and focuses on the Great Western and LNER locomotives which became part of BR stock in 1948. The second book
