Rock Island Tower was maintained and operated by the Elgin, Joliet & Eastern Railway. Rock Island Tower housed a electro-mechanical interlocking which consisted of a 68 lever Saxby and Farmer Machine and a 12 lever Union Switch and Signal Model S-8 machine. The Saxby and Farm Machine had 26 active levers and 42 spare levers, the US&S S-8 Machine had 9 active levers and 3 spares. The S-8 Machine was used to control the signals for the Rock Island Lines. It is unknown to what happened to both machines after the tower closed, a local claimed to have scrapped it. The tower was tore down on March 23rd, 2010 at 0900 hrs by CNRR.