Union Switch and Signal
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Union Switch and Signal1881 - 2009
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.
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The C.H. Hanson Company
1939-1945
