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Air-brake systems may include a wig wag device which deploys to warn the driver if the system air pressure drops too low. Manual wig wag in warning position. This device drops a mechanical arm into view when the pressure in the system drops below the threshold of sufficient pressure to reliably deploy the brakes. [12]
It is not possible to tell if this wig wag was an OEM installation or after market addition. It does not replace the pop valves on the dash board for setting the brakes in the event of low pressure. It replaces the low air warning buzzer.Rvannatta 03:26, 29 November 2008 (UTC) I removed this comment:
US&S operated as an independent company until 1917, when it became a subsidiary of the Westinghouse Air Brake Company (WABCO). In 1968, American Standard purchased WABCO and reorganized US&S as a separate division. [6] In 1988, Ansaldo STS, a global supplier of signaling, control and automation systems, purchased US&S from American Standard.
Should a brake line split, or a carriage become uncoupled, the air pressure will be lost and the brakes applied, by springs in the case of trucks, or by a local air reservoir in trains. It is impossible to drive a truck with a serious leak in the air brake system. (Trucks may also employ wig wags to indicate low air pressure.)
Wig wag (washing machines), a solenoid design used in some brands; Wigwag, the Canadian version of the English Curly Wurly bar; Wigwag, a tool used in watchmaking for polishing parts; WigWag, a Nottingham–based website development and communication company; Wig-wag, a tool used to stack sheets of rubber compound into boxes or onto pallets.
Westinghouse Air Brake Company's Rotair Valve [18] The first form of the air brake consisted of an air pump, a main reservoir (pressure vessel), and an engineer's valve on the locomotive, and of a train pipe and brake cylinder on each car. One problem with this first form of the air brake was that braking was applied to the first cars in a ...