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One of two (front and rear) whistles on steam locomotive 60163 Tornado. A train whistle or air whistle (originally referred to as a train trumpet or air trumpet) is an audible signaling device on a steam or gas locomotive, used to warn that the train is approaching, and to communicate with rail workers.
The bell has been commonly referred to as the "Teardrop" bell by railroaders and signal fans alike because of its unique shape and thus the name has stuck. This bell has appeared on advertising literature for railroad signals as far back as the 1920s as far abroad as Chile and Italy on early wig wag crossings and flashers.
The whistle consists of the following main parts, as seen on the drawing: the whistle bell (1), the steam orifice or aperture (2), and the valve (9). When the lever (10) is actuated (usually via a pull cord), the valve opens and lets the steam escape through the orifice. The steam will alternately compress and rarefy in the bell, creating the ...
The railroad then developed a more effective system consisting of wooden balls, painted red, white or black, and hoisted up or down a pole on a rope-and-pulley system. The initial use of these signals was merely to indicate the on-time status of trains, rather than to control train movements.
The bell-and-hook coupling system was first introduced in the Cape of Good Hope in 1902, when two CGR Type A 2-6-4T locomotives were acquired as construction engines on the new 2 ft (610 mm) narrow gauge Avontuur Railway which was being constructed out of Port Elizabeth through the Langkloof. In South Africa, these couplers were used on only ...
The Swiss Railway Clock Antique Railroad Bell. Magma Arizona Railroad Engine #6: This locomotive was built in 1907 by the Baldwin Locomotive Works and operated in the Magma Arizona Railroad for 54 years. It was purchased by the Scottsdale Railroad & Mechanical Society in 1977 and is the only Arizona & New Mexico engine remaining in Arizona ...
The horn bell's length, thickness and diameter contribute to the frequency of the note the horn produces. When vibrated by the diaphragm, the column of air in the bell oscillates with standing waves. The bell's length determines the waves' wavelength, and thus the fundamental frequency (pitch) of the note produced by the horn (measured in hertz ...
The bell itself weighs 66,000 pounds (30,000 kg); with clapper and supports. The total weight which swings when the bell is rung is 89,390 pounds (40,550 kg). The largest Bell of the People's Salvation Cathedral is the largest free-swinging church bell in the world, surpassing the Petersglocke of Cologne Cathedral.