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The train's whistle can change in pitch over time.
but crack
The conductor.
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Since you are also on the moving train, the pitch should remain constant.
He turns the boat sideways, so the waves hit the boats side, causing Richard Parker discomfort. He then blows the whistle, so Richard Parker associates the blowing of the whistle will discomfort. Then, when Pi boards the boat, he blows the whistle, which scares Richard Parker, allowing Pi to stay on the boat.
Traditionally, the train engineer gives horn signals. If the engineer is not present, or busy, either the co-engineeror conductor can blow the horn. Amtrak has their General Electric P42 locomotives equipped with a horn button on the engineer and conductor sides of the cab.
The Wichita Train Whistle Sings was created in 1968.
Well if it blows you can either START watever you are playing or it can mean time out. It also can be used as a backup to a fire alarm in order to get people to exit a building during an emergency. It can also be used to signal a train to pull off from a railway station and that all is safe for the train to commence its journey. In football it can be blown to signal many things in the game, this applies to many sports where a whistle is used.
Yes. 'Train whistle' is a compound noun, which means that both 'train' and 'whistle' are nouns individually but here they work together. The word 'train' is applied to 'whistle' in the place of an adjective, that is, a word that describes the type of whistle. But have you ever heard a wolf whistle? Many compound nouns eventually run together, like handbook or cupboard, and maybe one day, wolfwhistle.
toot
This is known as the Doppler effect. As the train approaches you, the wavelength of the sound waves it emits are compressed, and therefore the whistle sounds higher. When the train is moving away, the wavelengths are extended, causing the whistle to sound lower. If the train were not moving at all, the pitch you would hear from the whistle would be somewhere between the high and low pitches you hear when the train is moving.