Chicago Transit Authority
Chicago, IL, U.S.

CTA Red and Purple Line Modernization Program

The Chicago Transit Authority (CTA) selected the joint venture team of Fluor and Walsh Construction Company to design and build Phase One of the Red and Purple Line Modernization Program. The $2.1 billion project will be the largest capital project in CTA’s history, ultimately resulting in expanded capacity and improved infrastructure along the region’s most used rail lines.

The project involves building new elevated tracks along a 1.9-mile section in Chicago, including new bridges, support structures and existing tracks. Four of the CTA’s busiest stations will be replaced, and a grade-separated bypass for the Brown Line at Clark Junction will be built. The signal system will also be upgraded.

Client's Challenge

The Red and Purple Lines serve customers in some of the densest neighborhoods in Chicago, and weekday rush period ridership increased nearly 40 percent over a five-year period. The modernization program will allow the lines to accommodate more riders, improving mobility in the area.

Additionally, most tracks and bridges are nearly 100 years old. Upgraded infrastructure will reduce the need for frequent repairs and maintenance that disrupt service.

Fluor's Solution

Fluor and Walsh, along with designer Stantec Consulting Services, will bring decades of industry megaproject and transit experience to this massive program, delivering state-of-the-art services, improved quality, safety and reliability, and an upgraded customer experience.

The project will improve access by creating Americans with Disabilities Act (ADA)-compliant platforms and stations. The installation of a new signal system on 23 track miles will further enhance train flow and service reliability.

In 2021, the Walsh-Fluor team received the DBE Innovator of the Year Award from the Federation of Women Contractors for its Building Small Business Program, which has secured more than $5.5 million in loans for small businesses since January 2020.



Fluor and Walsh broke ground on the Red and Purple Line Modernization Phase One Project in October 2019. Construction is scheduled to be completed in early 2025.