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George Westinghouse founded Union Switch & Signal in 1881, consolidating the assets of companies that had pioneered closed track circuits and interlockings. Operating as an independent company until 1917, US&S became a subsidiary of Westinghouse Air Brake. In 1968, American Standard purchased the entire operation and reorganized US&S as a separate division.
In 1988, Ansaldo purchased US&S from American Standard. In November 1993, US&S became a publicly traded company with shares listed on Nasdaq. In December 1996, US&S merged with the other signaling investments of Ansaldo located around the world. As a result of that merger, US&S is now a wholly-owned subsidiary of Ansaldo Signal, a global supplier of signaling, control and automation systems with operations worldwide.
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