Mainly for safety reasons. The patterns of longs and shorts are a code. For instance, the customary "long, short, short" that most of us have heard means that the train is approaching a road and about to pass through it, so cars should use caution.
Most train horns have more than one leval of sound output, and some locales have orenances requiring trains to use "soft" levels. And some just work better than others.
You may hear train horns at night because trains are required to sound their horns at railroad crossings to alert drivers and pedestrians of their presence for safety reasons.
The engineer pushes a button. Which controls a relay, which allows air to escape via the horn.
Trains were equipped with horns or bells or whistles to warn vehicles and pedestrians that they were coming. John Holliday was the one who suggested adding a device like this.
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They can have horns
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Yes, trains in urban areas are typically subject to noise ordinances designed to minimize disturbances to residents. These regulations can limit the volume of train horns, the times trains can operate, and other noise-related activities. Local governments often enforce these ordinances in conjunction with transportation authorities to balance transit needs with community peace. However, the specifics can vary widely depending on the city and its regulations.
The different types of horns commonly used in musical instruments are brass horns, woodwind horns, and natural horns. Brass horns include the trumpet, trombone, and French horn. Woodwind horns include the saxophone and clarinet. Natural horns are typically made from animal horns and are used in traditional and folk music.
horns
narwhals have horns
Horns.