[Norsider]

I think a subway down Grand Avenue (accessing Navy Pier) would be way more useful than a line down Carroll. I'd extend the line from Navy Pier to the Mart, then a southward turn to service both major train stations on Clinton, then a slight jog west to run south down a booming S. Halsted street, make an eastward turn to join up with the Orange Line Halsted stop, then the Red Line Cermak Stop, with a termination right under McCormick Place.

The name of this line will be: The Most Useful Line Ever Line.