This Ian Allan BR Diesel Locomotives Book is a compilation of 1 foot : 4mm Scale Drawings of the Class 15, 17, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 33, 35, 37, 40, 42, 43, 44-46, 47, 50, 52, 55, 53 (Falcon), Lion & Kestrel Diesel Locomotives and the Class 73 & 74 Electro-Diesel Locomoves built during the '50's & '60's.