The Chicago Transit Authority’s Blue Line branch is slated for a $492 million upgrade.
The four-year program will include track and infrastructure improvements, stationhouse upgrades, subway improvements, signal upgrades and power upgrades.
The plan will improve reliability and reduce the commute times between downtown and O’Hare by up to 10 minutes, officials said.
Mayor Rahm Emanuel said the investment in the Blue Line’s O’Hare branch is the largest comprehensive investment in the line since it was extended from Jefferson Park to O’Hare 30 years ago.
Officials said the O’Hare branch has seen significant ridership increases, providing more than 25 million rides last year and growing 25 percent over the past five years.