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Control handle and valve for a Westinghouse Air Brake. A railway air brake is a railway brake power braking system with compressed air as the operating medium. Modern trains rely upon a fail-safe air brake system that is based upon a design patented by George Westinghouse on March 5, 1868. The Westinghouse Air Brake Company (WABCO) was subsequently organized to manufacture and sell Westinghouse's invention.
When the engineer applied these brakes, the pipe filled with air and squeezed the brakes. In 1869, an engineer named George Westinghouse realized the importance of safety in the relatively new railroad industry and invented the first triple-valve air-brake system for railcar use.Westinghouseâs system worked the opposite way of a direct air-brake system. Once the system reaches its operating pressure, the brakes are freed and ready to use. 2  Applying: As the brakes are applied, air pressure decreases. 3  As the amount of air decreases, the valve allows air back into the reservoir tanks, while the brakes move to the applied position.