The roll contains c40 waxed linen and acetate drawings by British Railways Locomotive Drawing Office, Brighton of mechanical details for an electro diesel locomotive. Drawing number range W.13600-13969.

Class 73/1. Axle and wheels. Pipes and conduits for AWS. Equipment and partition, cab side. Air ducts for traction motors at No. 1 end. Floor plates for the engine. Footplates for the engine. Footplates at front and for the bogies. Buffer. Buffer beam. Painting diagram.