Song, Charles C. S.Lin, WenchinGong, Cuiling2012-08-222012-08-221992-08https://hdl.handle.net/11299/131868The Mainstream System excluding North Branch and the Calumet System excluding Indiana A venue tunnel of Greater Chicago were studied in 1988. The solutions based on these systems were suggested in a project report [1)1 in 1988. Since then a new North Branch tunnel is being planned to join the original Mainstream System, and the Indiana A venue tunnel to be added to the Calumet System, it therefore becomes necessary to reevaluate the previously suggested operational plans. A new computer simulation and solution alternatives for these expanded systems are described in this report. The 'North Branch System has also been studied separately and reported herein.en-USReport