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Dulles Corridor Metrorail

An 11.7-mile extension of Washington, D.C.'s Metrorail transit system

The Bechtel-led team is the design-build contractor for Phase 1 of the Dulles Corridor Metrorail Project for the Metropolitan Washington Airports Authority. The 11.7-mile project, known as the Silver Line, provides a new high-capacity connection for millions of tourists, business visitors, and commuters in the Washington, D.C. area.

As one of the most complex rail construction projects in the United States today, the rail line includes a 6-mile section of elevated track that carries Metrorail trains above the Capital Beltway and over Tysons Corner at heights up to 65 feet. Construction required an enormous overhead crane that was custom-built to lift elevated segments into place between huge piers along the line. The yellow crane, weighing 366 tons, stretched across 12 lanes of traffic and moved by remote control from one segment to the next.

The project extends service from the existing Orange Line at the East Falls Church station to Reston in Fairfax County, Virginia. The corridor encompasses Tysons Corner and the Reston Herndon area, the state's top employment regions.

Developing Business and Skills

Bechtel worked with nearly 200 disadvantaged businesses to develop critical skills for large-scale infrastructure projects. We also partnered with local colleges and universities to provide internships and careers to the next generation of engineers and construction workers.


t's an overhead crane called a truss, custom-built to hoist each of the rail line's elevated segments into place between the giant piers along the line's path and to propel itself by remote control from one stretch to the next. The truss weighs 366 tons and stretches about 360 feet, but it takes up less space than the multiple ground-based cranes and trucks used to build standard girder or beam bridges with 100-foot-long decks.