New device which alerts train drivers to dangers on foggy days when signals are hard to see.
"Pity the poor driver on those misty, foggy days, when signals are hard to see.." L/S of a steam train approaching the camera through fog. "But, the detonating fog signal came and gave the driver warning by sound." M/S of a device being attached to a railway track. Train passes over it and there is a small explosion.
"Today, in the busy centres the mechanical 'placer' simplifies and safeguards man and machine." M/S of a man demonstrating an automated machine which places detonating signals on the line. It places then removes the small detonators. C/U of two railway signs. One reads "Up Slow" and the other "Up Fast". M/S of a signalman pulling a lever. C/U of machine placing detonator on the line. Train passes over it and there is small explosion under the wheels.
Was an item in Eve's Film Review issue number 644.