CTA’s Red Purple Bypass Is Now Open, Ready For Riders – CBS Chicago - the newscaster claimed that this is the first new permanent "mainline" track in 28 years.
Red and Purple Modernization Program - CTA
CTA Red & Purple Modernization: Red-Purple Bypass Project - CTA
CGI videos of the bypass and trains on it:
0 RPB Master 2020 10 08 No Titles - YouTube
CTA Proposed Red-Purple Bypass: Track Level View - YouTube
CTA Proposed Red-Purple Bypass: Street Level View - YouTube