Post by SkyFire on Jun 18, 2020 10:31:48 GMT
"A film about one of the most responsible and professional jobs on British Railways. Practical work in shop and signal box, on gantry and track side, coupled with instruction in mechanics, electricity, electronics and draughtsmanship, lead the apprentice into the intricacies of design, the excitement of research and experiment, and the intense satisfaction of being in on the changeover from old-style semaphore signalling to a new coloured light system."