London Transport Supplement to Traffic Circular

This collection brings together London Transport Supplements to Traffic Circulars issued between 1955 and 1980—internal privately-issued operational documents produced for staff rather than the travelling public. Issued to accompany formal Traffic Circulars, these technical supplements provided detailed maps and diagrams documenting changes to signalling systems, track layouts, and operating procedures, particularly in connection with new line openings, extensions, and reconfigurations. Ephemeral by nature and rarely retained, surviving examples offer a rare insight into the practical, behind-the-scenes management of London’s transport network during the post-war decades.