The roll contains c 80 acetate and waxed linen drawings of 25kv ac locomotive general arrangements, general outlines, brake gear and bogie arrangements for a prototype train for the Post Office (London) Railway, British Transport Commission Type 4 and Type 3 (Class 37) and for the following overseas railways, Pakistan, Bulgaria,Yugoslavia, Taiwan, Portugal, Ghana, New Zealand, Rhodesia, Jamacia, India, Turkey, South Africa, Brazil, Iran and East Africa. Drawing numbers V3100 - 3201; DN3142 - 3202; T3100; T3159; P3136; P3202.