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To determine whether rehabilitation or replacement was needed for four rail transit lines constructed between 1891 – 1905, the Chicago Transit Authority asked RRJ to assess the condition of the elevated train structures.
RRJ conducted tests specifically tailored for each train line, evaluating end connection continuity, load distribution, critical stresses, impact loading, fatigue, and longitudinal forces caused by train braking.
Test data showed it was possible to extend the life of the existing structures well into the future, giving the CTA a projected cost savings of $3.7 billion when compared with replacement.