Severe fog hits London - traffic in chaos.
Full title reads: "WORST FOG IN MEMORY".
Several shots of a queue waiting for train at station in fog. Timetable board with sign 'Fog Service in Operation.' Close up shot of fog service board. Train moves past camera - it is hardly seen through thick fog. Long shot, interior of signal box. Back view, signal man looking out of window. Train going past. Man picking up detonator and walking off. Back view, man walking to line. Close up shot of detonator fixed to rail. Train going past exploding detonator. Close up shot of a man waving flag. Long shot of road with bus passing camera. Travel shot of traffic jam barely visible through fog. Long shot through traffic jam. Man lighting flare. Lorry past flare on island. Long shot of policeman directing traffic.