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Union Switch & Signal
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<p>Union Switch & Signal (commonly referred to as US&S) was an American company based in <a href="/facts/Pittsburgh/42yPHyS0">Pittsburgh</a>, <a href="/facts/Pennsylvania/HGqC5bBm">Pennsylvania</a>, which focused on <a href="/facts/Railway_signaling/yK37bHt7">railway signaling</a> equipment, systems and services. The company was acquired by Ansaldo STS (from 2015, <a href="/facts/Hitachi_Rail_STS/ACqv3uPj">Hitachi Rail STS</a>) in 1988, operating as a wholly-owned company until January 2009, when US&S was renamed "Ansaldo STS USA" to operate as a <a href="/facts/Subsidiary/l25YN38x">subsidiary</a> of Ansaldo in the Americas and Asia. </p>