"Union Switch and Signal Inc. (commonly referred to as US&S) was an American company based in Pittsburgh, Pennsylvania, which focused on railway signaling equipment, systems and ...
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services. The company was acquired by Ansaldo STS (from 2015, Hitachi Rail STS) in 1988, operating as a whole-owned company until January 2009, when US&S was renamed "Ansaldo STS USA" to operate as a subsidiary of Ansaldo in the Americas and Asia." - (en.wikipedia.org 10.08.2021)
