A railway detonator, (torpedo in North America) or fog signal is a coin-sized device that is used as a loud warning signal to train drivers. It is placed on the top of the rail, usually secured with two lead straps, one on each side.
A railway detonator, (torpedo in North America) or fog signal is a coin-sized device that is used as a loud warning signal to train drivers. It is placed on the top of the rail, usually secured with two lead straps, one on each side.
Source: Wikipedia "Detonator (railway)" · CC BY-SA 4.0
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