The roll contains five waxed linen drawings by British Railways Locomotive Drawing Office, Brighton of mechanical parts for electro diesel locomotives including pipe clips, battery box and buffer beam. Drawing numbers W.12828; W.12960; W.13800; W.13863; W.13864.

Class 73/0. Battery box, single cradle. Class 73/1. Brake details. Arrangement and fitting on cab front and buffer beams. Arrangement of air pipes and bogies.