The CTA is trying to complete $20 million in improvements on the Green Line, before the Red Line is shut down next month.
Red Line trains that normally operate on the median of the Dan Ryan Expressway between Cermak-Chinatown and the 95th Street Red Line terminal will be detoured to the Green Line South Side elevated tracks May 19 through about Oct. 19.
Red Line trains will run on the elevated Green Line tracks between the Ashland/63rd and Roosevelt stations, the CTA has said.
Free shuttle buses are being made available from the four Red Line stations south of 63rd Street to the Garfield Green Line station.
A temporary bus-staging area is being created at Garfield to accommodate the thousands of additional passengers expected to use those buses.
Improved lighting and more security cameras are also being installed.