Swissvale is a borough in Allegheny County, Pennsylvania, United States, 9 miles (14 km) east of downtown Pittsburgh. Named for a farmstead owned by James Swisshelm, during the industrial age it was the site of the Union Switch and Signal Company of George Westinghouse. The population was 8,624 at the 2020 census.

Union Switch & Signal was an American company based in Pittsburgh, Pennsylvania, which focused on railway signaling equipment, systems and services. The company was acquired by Ansaldo STS in 1988, operating as a wholly-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.