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Market Street Elevated Reconstruction

Owner: Southeastern Pennsylvania Transportation Authority (SEPTA)
Location: Philadelphia, Pennsylvania
Construction Value: $240 Million

Market Street Elevated ReconstructionAs a major subconsultant, Gannett Fleming provided engineering services for the replacement of 11,000 feet of elevated guideway, five elevated stations, and one at-grade station on SEPTA's Market-Frankford Line. This challenging project required the replacement of the 90-year-old steel structure while maintaining rail service on weekdays. The reconstruction of the stations was especially challenging as station operations were specified to be maintained while demolition of the existing stations and guideway and construction of the new stations and guideway were carefully staged. New stations were designed to provide modern transit station amenities while integrating the facilities with the existing urban environment.

Design Features:

  • New steel guideway with preassembled steel and concrete superstructure units
  • Direct Fixation Rail Fasteners
  • New ADA compliant stations designed to blend with existing urban neighborhoods
  • Rail service maintained on weekdays
  • Continuous station operations
  • Specialized construction staging.

Services Provided:

  • Structural inspection
  • Analysis of existing structure
  • Preliminary engineering
  • Constructability analysis
  • Utility coordination
  • Traffic control
  • Track design
  • Structural design
  • Geotechnical design
  • Traction power design
  • Environmental Assessment
  • Oversight of a station design
  • Construction-phase services.