. . . . "Union Switch & Signal company" . . . "Union Switch & Signal Company" . "Union Switch & Signal" . "Union Switch & Signal Co." . . . . . . "Union Switch & Signal" . . . "1881" . "US&S" . . . . "Union Switch and Signal Company" . . . . "First acquired byWABCoin 1917, then other owners. In January 2009, it became \\\"Ansaldo STS USA\\\"." . . "900" . . . "Ansaldo STS" . . . .