^ I'm not a freight rail expert, but suppose maybe its possible to relocate that freight yard south about 1/2 mile, still leaving plenty of room for 2 long parallel runways that can be used simultaneously?
I don't know what the historical precendent for acquiring industrial land for such projects is, but I imagine its much easier politically and probably not a great deal different economically than taking over residential areas.
Do any air buffs know if the flight patterns would conflict? To me it seems having east-west runways at midway would be the best case scenario since the O'hare runways will be east-west.
Sure this expansion would be expensive, but hardly more expensive than building an entire new airport, and it would provide for 2 large, legitimately international airports...
Then just add a crosstown airport express and they'll function as one