Phase II Dulles Corridor Metrorail Project

Phase II Dulles Corridor Metrorail Project
Name	Dulles Corridor Metrorail Project Phase II
Locale	Northern Virginia, United States
Transit type	Rapid transit
System	Washington Metro
Status	Completed
Start	2014
End	2022
Owner	Metropolitan Washington Airports Authority
Operator	Washington Metropolitan Area Transit Authority
Line	Silver Line (Washington Metro)
Character	Elevated, at-grade, aerial
Electrification	Third rail

Contents

Phase II Dulles Corridor Metrorail Project The Phase II Dulles Corridor Metrorail Project extended the Silver Line (Washington Metro) through Tysons, Virginia, Reston, Virginia, and into Loudoun County, Virginia, providing rail access to Washington Dulles International Airport, Ashburn, Virginia, and connections to the Metrorail network. Planned as a public–private and multi-jurisdictional effort, the project involved coordination among the Metropolitan Washington Airports Authority, Washington Metropolitan Area Transit Authority, Commonwealth of Virginia, Fairfax County, and Loudoun County while interfacing with federal stakeholders including the Federal Transit Administration and the National Park Service.

Background and Planning

Planning for the Phase II extension built on studies by the Metropolitan Washington Airports Authority and proposals from the Northern Virginia Transportation Commission, the Commonwealth of Virginia Secretary of Transportation, and reports by the Federal Transit Administration that followed the earlier Phase I work with Arlington County, Alexandria, Virginia, and Fairfax County. Environmental review documents referenced statutes such as the National Environmental Policy Act, and consultations involved agencies including the United States Fish and Wildlife Service and the Virginia Department of Transportation. Public outreach engaged civic groups like the Reston Citizens Association, business organizations such as the Greater Washington Board of Trade, and landholders including the Metropolitan Washington Airports Authority leaseholders at Washington Dulles International Airport.

The extension runs from the Phase I terminus at Wiehle–Reston East station through new stations at Reston Town Center, Herndon, Washington Dulles International Airport, and Loudoun Gateway near Route 28 (Virginia), terminating at Ashburn station. The alignment required crossings of the Dulles Toll Road, interactions with Route 123 (Virginia), and proximity to preservation lands such as the Virginia Piedmont. Infrastructure elements included aerial guideway structures, at-grade track sections, rail systems integrating with WMATA rolling stock fleets, and passenger facilities designed to connect with Washington Dulles International Airport terminals and with bus services operated by Fairfax Connector and Loudoun County Transit.

Construction contractors included major firms that worked under agreements with the Metropolitan Washington Airports Authority and the Commonwealth of Virginia, requiring engineering solutions addressing soil conditions near the Potomac River watershed and utility relocations coordinated with the Washington Suburban Sanitary Commission and the Metropolitan Washington Airports Authority engineering division. Significant structures included aerial viaducts, the airport station design interfacing with the Dulles Access Road, and noise mitigation measures adjacent to residential areas in Reston, Virginia and Herndon, Virginia. Construction phases observed safety standards from organizations such as the Occupational Safety and Health Administration and incorporated materials specified by the American Railway Engineering and Maintenance-of-Way Association.

Capital funding combined sources from the Commonwealth of Virginia, the Metropolitan Washington Airports Authority, the Washington Metropolitan Area Transit Authority, and local jurisdiction contributions from Fairfax County and Loudoun County alongside federal grants overseen by the Federal Transit Administration. Budget elements reflected cost controls following audits influenced by the Government Accountability Office and legislative oversight from the Virginia General Assembly and testimony to committees chaired by members of the United States House Committee on Transportation and Infrastructure. Private sector financing and procurement strategies referenced models used in other projects involving the Port Authority of New York and New Jersey and the Los Angeles County Metropolitan Transportation Authority.

Service on the extension was integrated into WMATA scheduling and staffing frameworks with interlining that connected to Rosslyn station and the Blue Line (Washington Metro), and fare policy coordinated with the WMATA Fare System and regional transit partners including Metrobus and MARC Train. Operational planning accounted for airport passenger flows to and from Washington Dulles International Airport and emergency response coordination with agencies such as the Metropolitan Washington Airports Authority Police and the Arlington County Police Department for incidents impacting the corridor. Ridership projections referenced modeling methodologies used by the National Transit Database and analytic studies from the Mineta Transportation Institute.

Environmental assessments addressed wetlands in the Chesapeake Bay watershed, impacts on bird habitats monitored by the United States Fish and Wildlife Service, and mitigation measures developed with guidance from the Environmental Protection Agency. Community impact analyses included traffic pattern changes affecting Route 7 (Virginia), transit-oriented development initiatives promoted by the Fairfax County Economic Development Authority, and affordable housing concerns raised by the Loudoun County Board of Supervisors and advocacy groups such as the Reston Citizens Association. Noise abatement, stormwater management, and cultural resources reviews involved consultation with the Virginia Department of Historic Resources and the National Capital Planning Commission.

Longer-term planning considers capacity upgrades to rolling stock similar to orders placed by the Washington Metropolitan Area Transit Authority and technology enhancements paralleling deployments by the Metropolitan Transportation Authority (New York), including communications-based train control implementations discussed in forums with the Federal Railroad Administration and interoperability assessments with regional networks like MARC Train and Virginia Railway Express. Local jurisdictions such as Fairfax County and Loudoun County continue to evaluate transit-oriented development around Ashburn station and corridor station areas with inputs from the Northern Virginia Transportation Authority and planning agencies such as the Greater Washington Partnership.