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A railway fog signal is a small metal device containing a limited quantity of explosive. In use, the device is placed on the running surface of a rail such that any rail-mounted vehicle passing over it would cause it to explode, and in so doing, alert the driver of the vehicle to a hazard on the line ahead. A common use for railway fog signals is to protect possessionsFeatures:

• Size: 51mm diameter by 9mm deep
• Case: The outer case of each signal is comprised of two parts, a base plate and an upper flat-topped dome, both are made from cold reduced tinplate of thickness 0.43mm and joined at the rim
• Construction: The rim joint is comprised of a single fold, made by bending the edge of the upper part of the case underneath the base plate and sealed to prevent entry of moisture
• Percussion: Each signal contains five percussion caps fitted on an anvil made of tinned malleable iron, sufficiently soft not to indent the rail. The anvil assembly is held securely in a central position on the base plate by a perforated tinplate disc
• Explosive: Each signal contains 8 grammes weigh of gunpowder
• Binding Strip: Signals shall have a lead strip, average length 178mm by 6.4mm wide and 0.8m thick firmly soldered to the base plate 
• Marking: The word SINGLE and figures to show the month and year of manufacture shall be stamped on the dome plate of each signal and painted with a protective coating of paint. The Signals have a maximum service life of 5 years (60 months) from the date of manufacture after which they should be disposed of in line with section 13.

£17.50
Price Including VAT: £21.00