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Union Switch and Signal : ウィキペディア英語版 | Union Switch & Signal
Union Switch and Signal (US&S) was a supplier of railway signaling equipment, systems and services in Pittsburgh, Pennsylvania. As of January 1, 2009, US&S is known as Ansaldo STS USA. ==History==
George Westinghouse founded Union Switch & Signal in 1881, consolidating the assets of the Union Electric Signal Company (founded by track circuit inventor William Robinson) and the Interlocking Switch & Signal Company (which had pioneered interlockings).〔Ansaldo STS. ("History of Ansaldo - key milestones." ) Accessed 2011-07-12.〕 In 1925 US&S acquired the Hall Signal Company, primarily to obtain the latter company's patents for searchlight signals.
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