sentences:  It provided passenger service to the western Illinois cities of Rock Island, Monmouth and Galesburg for two decades, with freight service surviving into the 1950s on the barest remnants of a once-impressive system.The older of the two RIS divisions was the line from Monmouth east to Galesburg, which was called Western Illinois Traction prior to completion of the line.By the time this 19-mile segment was put into service in May 1906 it had become part of the RIS.