Book excerpt: The British Railways ‘Pilot Scheme’ orders of 1955 included six North British Type 2 diesel-hydraulic locomotives, these being introduced during 1959 for use on the Western Region. Without operational experience, a further fifty-two locomotives were delivered between 1959 and 1962. The fleet survived intact until 1968, when half of the class was withdrawn due to declining traffic levels across the UK, with successive National Traction Plans progressively selecting the less successful, non-standard and ‘numerically-challenged’ classes for removal from traffic. All fifty-eight locomotives were withdrawn by New Years Day, 1972. This book, the second of two, builds on the overview of the class provided in Volume 1, and makes extensive use of available archive material and the personal observations of numerous enthusiasts. Previously unpublished information, covering the performance issues of these locomotives, form a central focus, together with details of fire incidents and accidents. Liveries and detail differences are given in-depth treatment to illustrate that there really were reasons and a logical progression behind the complicated series of design modifications applied to the Class. Volume 2 concludes with sections on storage, withdrawal and final disposal.