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​​​​How does the Train Horn works?

Some people might think that a train horn is a pre-recorded sound that just plays when activated, but that's not how it works. A train horn is operated mainly by compressed air. Air tanks are used to store and generate compressed air for the train horn to operate. When the train engineer presses the train horn button, a strong burst of compressed air from the air tanks will flow through the narrow opening of the horn. This pressure makes the diaphragm of the train horn vibrate or oscillate towards the external opening of the horn or the nozzle and it creates the loud sound that we hear when the train is approaching. The sloping structure of the train horn helps in making the oscillated sound even louder to hear. The sound produced by the train horn can actually reach up to 150 decibels.