AECOM provided design and construction services for this $1.6 Billion design-build project, an 11.6-mile extension of the Metrorail towards Dulles International Airport. Work included utility relocation and right-of-way acquisition, preliminary engineering, project management, and procurement for five passenger stations, two tunnels (approximately 2,100 feet, 60 feet, 4,000 feet) and nine bridges.

The project required multi-agency coordination with Metropolitan Washington Airport Authority (MWAA); Virginia Department of Rail and Public Transportation (DRPT); Washington Metropolitan Area Transit Authority (WMATA).