The roll contains seven waxed linen drawings by British Railways Locomotive Drawing Office, Brighton of mechanical components for electro diesel locomotives. Drawing numbers W.12825; W.12846; W.12955; W.12973; W.13823; W.13864; W.14015.

Class 73/0. Arrangement of motor bogie brake gear. Class 73/1. Body side members. Radiator duct sections. Fuel tank details. Arrangement and details of doors in bodyside and for battery boxes. Location and fixing of fuel equipment frame. Arrangement of motor bogie.