This Ian Allan BR Diesel Locomotives Book is a compilation of 1 foot : 4mm Scale Drawings of the Class 20, 25, 26, 27, 31, 33, 37, 40, 44-47, 50, 55, 56 & 58 Loco's, the Class 253 & 254 HST Sets and the Class 73 Electro-Diesel Locomoves built during the '50's - '80's.