Mass Transit Elevated Train Structures

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.

How RRJ helped

  • Conduct full-scale diagnostic load tests
  • Monitor structural performance
  • Develop customized data acquisition system
  • Analyze data

Project Details

Location Chicago, IL
Client City of Chicago
Market Transportation
Services Field & Laboratory Testing, Structural Engineering Services

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