Metra will run a line from O’Hare west to Elgin and then south to Joliet.
While the South Suburbs need some sort of access to such a line, this line concentrates on the areas with the most godawful traffic known to mankind outside of Southern California or Manhattan. Having driven Route 59 for years, that area is just a friggen nightmare–train access won’t solve that problem, but it should alleviate some traffic–especially to O’Hare.