{"id":6842,"date":"2022-01-01T12:07:37","date_gmt":"2022-01-01T12:07:37","guid":{"rendered":"https:\/\/www.systra.com\/ibt\/?post_type=projects&p=6842"},"modified":"2026-04-17T21:56:45","modified_gmt":"2026-04-17T21:56:45","slug":"chicago-transit-authority-cta-red-purple-modernization-project-chicago-illinois","status":"publish","type":"projects","link":"https:\/\/www.systra.com\/ibt\/project\/chicago-transit-authority-cta-red-purple-modernization-project-chicago-illinois\/","title":{"rendered":"Chicago Transit Authority (CTA) Red-Purple Modernization Project – Chicago, Illinois"},"content":{"rendered":"\n
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Technical details<\/div>\n \t
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Customer<\/div>\n\t
Chicago Transit Authority<\/div>\n\t <\/div>\n
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Dates<\/div>\n

Construction Completed:
\n2022<\/p>\n<\/div>\n <\/div>\n

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Localisation<\/div>\n
Chicago, Illinois<\/div>\n <\/div>\n
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Partners<\/div>\n
Contractor: Walsh Construction and joint venture partner Fluor Corporation.<\/div>\n <\/div>\n
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Activity<\/div>\n
SYSTRA IBT's Role: Detailed design of the segmental concrete guideway. Engineer of Record for the segmental structure.<\/div>\n <\/div>\n \n \n <\/div>\n\n\n\n
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DESIGN-BUILD<\/h2>\n\n\n\n

Total Length: <\/strong>15,442 m (50,660 ft)<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n

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As part of the Walsh-Fluor Design-Build Team, SYSTRA International Bridge Technologies developed a segmental concrete guideway for a major portion of
The US$2 billion Red-Purple Modernization project in Chicago. <\/strong><\/p>\n\n\n\n

This design required approval of an alternate technical concept that significantly improved upon the baseline steel design. This is the first segmental structure built by the Chicago Transit Authority (CTA). The CTA operates the famous Chicago \u2018L\u2019 (short for \u201cElevated\u201d) rapid transit system, which first began service in 1892 and is well-known for its steel structures.<\/p>\n\n\n\n

Significant factors for the concept\u2019s approval included:<\/strong><\/p>\n\n\n\n