I wish Chicago had 4 track subways like NYC for the flexibility to run multiple lines or express service. I always see people mention the Carroll Street Transitway. Is there a "Ghost Subway" map of Chicago, similiar to the following link on NYC? I agree with Beta_Magellan that the Blue Line does not have capacity for a high speed connection to O'Hare.
http://transportationnation.org/2012...nd-dusty-pics/