Construction season is in full swing at the Dulles Airport where Charles Stark, the Metropolitan Washington Airports Authority’s executive director of the Dulles Corridor Metrorail Project (a.k.a. the Silver Line) says, “This is the biggest year so far for construction all along the Phase 2 alignment from Reston west to Ashburn. The coming construction season is critical. There is a lot of work to be done."
Capital Rail Constructors (CRC), a joint venture of Clark Construction and Kiewit Infrastructure South, is the design-build contractor for all civil work, station and support facilities construction, bridges and aerial guideway structures, and train track and systems portions of Phase 2.
In recent months, CRC crews have made progress on the construction of the aerial guideway that will carry the Silver Line above Dulles Airport. Rail project officials have collaborated with airport executives and operations staff, airport users, employees and tenants such as cargo carriers and rental car agencies, to ensure construction does not interrupt critical traffic movements day or night.
The installation of girders for the superstructure portion of the aerial guideway has progressed through the heavily treed areas of the northeast end of Dulles Airport toward the Dulles Greenway. Deck work to prepare the guideway for future track installation is taking place.
Two large straddle bents–each requiring between 380 and 489 cubic yards of concrete –have been constructed over particularly wide areas where piers cannot be used to support the spans. These aerial guideway elements are comprised of two vertical columns connected by a cap, also known as a "bent," and will support the girders and deck over the road crossings as trains enter and leave the airport. A total of four large straddle bents will be needed at Dulles, and an additional four will be built over the eastbound Dulles Greenway at night.
A specific date has not been set for opening and it will be determined by the Washington Metropolitan Area Transit Authority after the Airports Authority finishes the line and transfers it to the regional agency.