Transit and Railroad

Commuter Rail Improvements, Sound Transit

Location: Tacoma to Seattle, Washington

This project was a major milestone for Washington State’s regional transit authority, Sound Transit, and the future of transportation in the Pacific Northwest. DEA was the prime consultant for this 6,900-foot-long rail project – Sound Transit’s final commuter rail segment to connect Tacoma and Seattle.

DEA was retained to provide civil engineering, surveying, right-of-way, and traffic planning services during the course of this three-phase commuter rail project. There were several significant challenges, including 50,000 cubic yards of fill on soft soils, two bridges over major arterial streets, relocation of a city street, 5,000 feet of new track, rehabilitation of 1,600 feet of timber trestle, a train layover facility, and relocation/ protection of major utilities.

Final design and construction were completed on an aggressive schedule requiring innovation and teamwork.

Project Awards

  • 2004 National Competition Award, ACEC Washington

Additional Services

Learn more about our other services and offerings:

Civil Engineering
Transportation Infrastructure
Traffic Engineering