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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.
One of the earliest brakes invented was the wooden block brake, which was used on horse drawn carriages for many years. This type of brake consisted of a long handle, which acted as a lever to make braking easier, attached to a block of wood.