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  2. Train noise - Wikipedia

    en.wikipedia.org/wiki/Train_noise

    Several distinct sounds are created by various parts of the train, such as engines, traction motors, brakes, and the wheels rolling on the rails. Roughness and irregularities on the wheel and rail surfaces are a source of noise and vibration. Rail joints and squats on the rail cause a familiar "clickety-clack" sound as train wheels roll over them.

  3. Railway air brake - Wikipedia

    en.wikipedia.org/wiki/Railway_air_brake

    A comparatively simple brake linkage. In the air brake's simplest form, called the straight air system, compressed air pushes on a piston in a cylinder. The piston is connected through mechanical linkage to brake shoes that can rub on the train wheels, using the resulting friction to slow the train.

  4. Railway brake - Wikipedia

    en.wikipedia.org/wiki/Railway_brake

    Air brakes at the outermost vehicles of a train are turned off using a tap. Vacuum brakes at the outermost vehicles of a train are sealed by fixed plugs ("dummies") onto which the open end of the vacuum pipe is placed. It is sealed against a rubber washer by the vacuum, with a pin to hold the pipe in place when the vacuum drops during braking.

  5. Compression release engine brake - Wikipedia

    en.wikipedia.org/wiki/Compression_release_engine...

    Jacobs claims that the use of the term "Jake Brake" on signs prohibiting engine retarding brakes violates their trademark and discriminates against Jacobs-brand products. [ 4 ] [ 5 ] In the U.S. state of Ohio , state law allows a board of county commissioners or township trustees to prohibit the use of compression brakes within unincorporated ...

  6. Why did your phone screech an emergency alert at 4:45 a.m ...

    www.aol.com/why-did-phone-screech-emergency...

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  7. Did your cell phone make a screeching noise today? Here’s why

    www.aol.com/america-national-emergency-alert...

    Essentially, what this means is that hundreds of millions of cell phones around the country made a screeching alert noise at approximately the same time today, beginning around 2:20 pm ET.

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