A major Chicago transit modernization effort has reached substantial completion, marking a significant milestone for one of the largest public transportation construction programs undertaken by the Chicago Transit Authority.
Fluor and joint venture partner Walsh Construction completed primary work on the CTA’s Red and Purple Line Modernization Phase One project, a $2.1 billion infrastructure investment designed to improve rail capacity, passenger accessibility and operational reliability across multiple transit lines.
Construction activities began in 2019 and focused on replacing and modernizing more than two miles of elevated track infrastructure between the Lawrence and Bryn Mawr stations on Chicago’s North Side.
The program also included reconstruction of four transit stations with upgraded passenger circulation, accessibility improvements, updated signage and enhanced security features.
One of the project’s key infrastructure elements was the Red-Purple Bypass at Belmont Station, an elevated rail structure designed to eliminate train conflicts between the Red, Purple and Brown lines. The bypass is intended to improve operational throughput and reduce congestion along one of the CTA’s busiest rail corridors.
In addition, crews installed approximately 11 miles of digital track circuit signaling infrastructure intended to support future system capacity and operational upgrades.
Fluor and Walsh Construction delivered the project while maintaining active rail operations throughout the construction period, requiring phased sequencing and coordination to minimize service disruptions.
Project partners included Stantec as designer, Hitachi for signaling systems and Meade as electrical contractor.
According to publicly released project information, the newly reconstructed stations and track segments entered full operation during summer 2025, while remaining closeout activities and final completion work are expected to continue through November 2026.
Transit agencies across major metropolitan markets continue investing in rail modernization programs aimed at addressing aging infrastructure, improving accessibility and expanding passenger capacity.
Projects involving elevated structures, signaling upgrades and phased station reconstruction often require complex construction management approaches because transit systems typically remain operational during active construction.
Infrastructure contractors working in the transportation sector continue to see opportunities tied to federally supported transit investment programs and long-term rehabilitation needs across legacy rail systems.
For transportation owners and contractors, the CTA modernization program highlights the increasing complexity of delivering large-scale rail infrastructure projects within active urban transit environments.
The project also reflects continued demand for contractors with experience in phased transit construction, signaling integration and infrastructure replacement in densely populated metropolitan corridors.
Source: Fluor.
