A train passes Westinghouse Electric Company in East Pittsburgh
Westinghouse Electric Company opened in East Pittsburgh in 1886. The company's primary function was the production of machinery used in the generation and transmission of AC current, which George Westinghouse had developed as an alternative to DC power. Though Westinghouse is known for his innovations in the electrical field, his inventions for the railroad industry were equally vital. His most important development, an air-brake system for locomotives, drastically improved train safety and were made mandatory on all trains in the US by the US Railroad Safety Appliance Act of 1893. Air brakes remain in use on trains, trucks, and buses today.