General Signal Corporation (formerly NYSE: GSX) was a publicly traded control equipment and systems company based in Stamford, Connecticut, and was listed in Standard & Poor's S&P 500 Composite Index of 500 of the largest public companies in the United States. It was a leading manufacturer of control systems technology primarily serving the transportation and telecommunication industries. In late 1998 it was bought for US$2 billion by a much smaller company, SPX Corporation.