Along the Light Rail Line

  • Along the Light Rail Line
  • Along the Light Rail Line


  • Location: Metro Washington, D.C.
  • Installed: December, 2018
  • Owner: Maryland Transit Administration
  • Engineer: Atkins
  • Contractor: Purple Line Transit Construction
  • Precast Producer: Faddis Concrete Products


  • Span: 12 feet
  • Rise: 11 feet
  • Length: 57 feet
  • Cover: 5.5 feet
  • Live Load: LRV
  • Skew Angle: 7 degrees
  • Type: Arch-Box
  • Finish: Formliner


Purple Line – The West Golf Cart Underpass Tunnel
12’ Span x 11’ Rise Arch-Box

On August 28, 2017, ground was broken for Maryland’s $5.6 billion Purple Line project. The Purple Line is a 16.2 mile light rail line that will link Maryland suburbs with the major arteries of the current D.C. Metrorail system to promote more efficient and less congested travel in and around the area. When completed, the project will include 21 stations, one tunnel, and off-road trails for bikers and pedestrians.

By 2040, daily ridership on the Purple Line is expected to reach 74,000. The first of seven ECO-SPAN® structures was installed in December, 2018. The West Golf Cart Underpass tunnel has a 12’ span, an 11’ rise, is 57’ long, and has a formliner finish on the headwalls and wingwalls. Faddis Concrete Products supplied the precast tunnel and the Purple Line Transit Constructors installed the structure. Construction on the Purple Line project is expected to extend into 2022.

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