About the Project

The Red and Purple Modernization (RPM) Program, the largest capital project in the CTA’s history, is needed to expand capacity on the CTA’s most utilized rail lines. With travel delays caused by aging infrastructure and capacity constraints, as well as growing ridership on the century-old lines, expanding capacity in this corridor is crucial to accommodate the CTA’s ridership into the future.


The RPM Program will be completed in phases, with the first phase of this program being RPM Phase One. The Walsh-Fluor Design-Build Team is the engineer, designer, and contractor for this phase of the Program.

Red-Purple Bypass (RPB)

Construction of a grade-separated bypass for the Brown Line at Clark Junction, just north of the Belmont station. This involves removing the largest physical capacity constraint in the RPM corridor, where three separate services on six tracks merge onto four tracks. This work will also realign and replace approximately 0.3-miles of Red and Purple mainline line tracks from the Belmont station to between Newport and Cornelia Avenues on the north, increasing speed, reliability, and capacity in the project corridor.

Lawrence to Bryn Mawr Modernization (LBMM)

Modernization, expansion, and addition of ADA accessibility at four Red Line stations (Lawrence, Argyle, Berwyn, and Bryn Mawr) and reconstruction and expansion of approximately 1.3-miles of track, structures and viaducts, to accommodate expanded stations and platforms from Leland Avenue to Ardmore Avenue.

Corridor Signal Improvements (CSI)

Installation of a new higher-capacity signal system from approximately Belmont Avenue to Howard Street, allowing for increased throughput of trains and reliability of operation.

Project Status

Walsh-Fluor broke ground on the Red-Purple Bypass on October 2, 2019. We began construction this past fall by drilling foundations for the bypass structure just north of the Belmont station. Walsh-Fluor is also currently re-aligning tracks near the Thorndale Station to make room for the track interlockings, signals, and electrical equipment in preparation for the start of major RPM construction in the Lawrence to Bryn Mawr area.


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