Crews are working to eliminate slow zones on the O'Hare branch.
The next phase includes work on the tracks between Rosemont and the airport. Beginning 3 a.m. Tuesday July 8, 24-hour shuttle service will replace rail service between the O'Hare and Rosemont stations.
Normal service is not scheduled to resume until Monday, July 28.
"Slow zones are, first and foremost, a safety issue, and so when we replace all of the tracks and spikes and infrastructure, we'll be back to 55 miles per hour in this corridor, ultimately reducing travel time for our customers significantly," said Ron Huberman, CTA president.
The final phase of the project includes replacing track between the Jefferson Park and Addison stops. That work is expected to be completed by the end of the year.
