Leaders say it means faster trips and more investment for the Far South Side.
Many hope the CTA Red Line extension project will improve access to jobs, education and economic development on the city's South Side.
Later Friday, Mayor Brandon Johnson will attend the groundbreaking for this major development. The $5.7 billion project has been in the making for a while.
It will extend the CTA Red Line from 95th Street to 130th Street, including building four new stations. The Red Line is the busiest rail line in the CTA.
There was a recent legal challenge over federal funding, but a judge ordered payment payments for the project to continue.
Once completed, the project is estimated to save those who would commute from 130th Street up to 30 minutes in their travel
The project is expected to bring more than 25,000 jobs to Cook County in the years to come.