The engineer pushes a button.
Which controls a relay, which allows air to escape via the horn.
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.
Yes, black whales do have blow holes. They keep them closed when they are underwater.
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.
You cannot blow up trains in Battlefield 2.
Dolphins have blow holes, not blow horns. The blow hole allows the dolphin to inhale and exhale air. The blow hole is analogous to a nostril in other mammals.
The Inuits used instruments such as drums and blow horns
yes copper is a very dangerous substance it will blow your unicorn horns off with bananas
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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What? Electric trains don't even have smoke
They can have horns
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