"2009Z"^^ . "500"^^ . . . . "Union Switch & Signal"@en . . "1881Z"^^ . . "Merged withAnsaldo STS"@en . . "Union Switch and Signal (US&S) was a supplier of railway signaling equipment, systems and services in Pittsburgh, Pennsylvania. As of January 1, 2009, US&S is known as Ansaldo STS USA."@en . . . . .