Abstract

The Red Purple Modernization (RPM) is CTA’s largest project to date. This construction update will focus on the Lawrence to Bryn Mawr Modernization (LBMM) which is the northern section of the project. Stage A was just completed and opened to revenue service on July 28, 2023. Stage A consisted of span-by-span erection method of 63 precast segmental spans plus 11 pocket track spans. All spans were erected with a Deal erection gantry. Stage B is now underway, and the team is ramping up for the second phase in which the LG will be re-assembled and the second set of 63 spans will be erected along the complete construction and commissioning of 4 commuter stations.