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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 .
The P-series horns have longer bells and a heavier manifold than the M-series. [9] The name of the horn is a P followed by the bells that face forward, followed by R if any are reversed, and then the numbers of the reversed bells; a P12345 is a true five-chime horn with all bells facing forward, while P135R24 has bells 2 and 4 reversed. [2]
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, Leslie introduced the Type S Supertyfon, with three- and five-chime versions. The three-chime S3L was B, D#, A. Leslie sold more horns than competitor Nathan ...
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).
2007- Daimler and Chrysler split. The new Daimler AG is founded. Freightliner LLC is renamed Daimler Trucks North America. Detroit Diesel starts production of the new heavy-duty engine – the DD15. Saltillo, Mexico plant opens. 2008- Parts of the company's operations are moved to Fort Mill, SC. Freightliner LLC becomes Daimler Trucks North ...
Hancock model 4700 air whistle intended for use on diesel locomotives. The Hancock air whistle was a railroad whistle intended for use on North American diesel locomotives in place of the standard air horn. [1] It was manufactured by the Hancock Valve Division of Manning, Maxwell and Moore. [2]
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