Explosive Alerts
Railways have long sought effective ways to warn operators of dangers ahead, especially in low visibility conditions. An innovative solution emerged in the 1800s: small explosives, known as detonators or torpedoes, which create loud sounds to alert train operators and workers on the tracks. This clever use of sound serves as a crucial backup safety measure, ensuring that even in the quietest moments, those on the railways are notified of approaching trains.In this clip
From this podcast

99% Invisible
Train Set: Track Three
Related Questions