This OPC BR Diesel Locomotives Hardback Book is a compilation of Scale Drawings, in relation to, amongst others, the Class 20, 24-27, 29, 31, 33, 35, 37, 40, 43, 44-46, 47, 50, 52, 55, 56, 58 & 60 Diesel-Electric Locomotives built during the '50's - '90's.