CHICAGO — Chicago Mayor Rahm Emanuel, Chicago Transit Authority officials, and Illinois Gov. Pat Quinn last week announced plans for a nearly $500 million overhaul of the Chicago Transit Authority's rail transit line that links downtown to O'Hare International Airport.

The plan calls for track, signal, and station improvements on the O'Hare branch of what's known as the Blue Line. More than 80,000 people use the line daily.

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