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An air horn consists of a flaring metal or plastic horn or trumpet (called the "bell") attached to a small air chamber containing a metal reed or diaphragm in the throat of the horn. Compressed air flows from an inlet line through a narrow opening past the reed or diaphragm, causing it to vibrate, which creates sound waves .
Robert Swanson (1905–1994) [1] was a Canadian researcher and developer, and is credited with the invention of the first five and six-chime air horns for use on locomotives. Swanson had worked as the chief engineer of a company called Victoria Lumber Manufacturing in the 1920s, when he developed a hobby for making steam whistles for ...
Leslie bought the patent and trademark rights to the Tyfon. In 1935 Leslie made the Leslie-Tyfon air horns for the first Burlington Zephyr locomotives. Leslie-Tyfon horns became the standard on most American railroads. [5] Leslie's horns were the most popular locomotive horns, and the standard for GM Electro-Motive Division models. Later ...
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In 2015, Freightliner purchased G533 and G535 from AWB Limited. [21] In the same year, they passed to Genesee & Wyoming Australia when their parent company, Genesee & Wyoming purchased Freightliner and integrated their Australian operations. [22] The 2 Gs now operate with Aurizon, following their purchase of ORA (formerly GWA) in 2022.
Diagram of a typical locomotive air horn power chamber, showing operation. Train horns are operated by compressed air, typically 125–140 psi (8.6–9.7 bar), and fed from a locomotive main air reservoir. When the engineer opens the horn valve, air flows through a supply line into the power chamber at the horn's base (diagram, right).
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The horns became an issue within the past few years. At a Nov. 27 promotion ceremony, the horns were blown so loudly that nothing else could be heard, another police officer said.
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