Union Switch & Signal
 | |
 US&S head office located in Swissvale, Pennsylvania, as seen in 1929 | |
| Type | Subsidiary |
|---|---|
| Industry | Electronics |
| Founded | 1881 |
| Founder | George Westinghouse |
| Defunct | January 2009 |
| Fate | First acquired by WABCo in 1917, then other owners. In January 2009, it became "Ansaldo STS USA". |
| Successor | Ansaldo STS USA |
| Headquarters | , U.S. |
Area served | Worldwide |
| Products | Railway signaling equipment, communication systems and services, level crossing signals |
Number of employees | 900 (2005) |
| Parent | Ansaldo STS (1988) |
Union Switch & Signal Inc. (US&S) was an American company based in Pittsburgh, Pennsylvania, which manufactured 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.