I'm not exactly sure if this fits this topic, but it is a construction project and it is along the Milwaukee West Line.
It looks like they have begun building the new line connecting along the south border of O'Hare Airport. The new line will branch off the old above Bensenville yard, pass over and then parallel the Milwaukee West Line to tower B17 where it will connect to the freight line along the west border of O'Hare. This line replaces the current line that runs through the airport construction project. They've been digging and driving pilings, but there is not much to show for it yet.
"No matter what happens, somebody will find a way to take it too seriously."