WMATA: Dulles Corridor Metrorail Project progress update e-mail 04 30 2015
Phase 2 Construction Marches Along at Dulles
Dulles Airport Construction: Girder Installation Horse Pin Run. Photo
courtesy of Capital Rail Constructors
While ridership on Phase 1 of the Dulles Corridor Metrorail Project (Silver Line) continues to meet and exceed expectations since opening last summer, the pace of Phase 2 construction building. Most of the work continues to take place at Dulles Airport but work has also extended onto the Dulles International Airport Access Highway, Dulles Toll Road and Dulles Greenway
The design-build contractor for Phase 2, Capital Rail Constructors, is focused on building approximately 200 piers to support the aerial guideway at Dulles.
The first girders, which provide horizontal support to the piers for the aerial guideway, are expected to arrive in late winter and will be delivered to Dulles Airport. The girders average 150 feet long, 8 feet tall and 190,000 pounds. Delivery and installation of these massive beams will require use of multiple cranes which will, in turn, necessitate lane closures and possible detours on the Airport property. Project crews are developing extensive plans for managing traffic during this time and the public will be informed of any impacts prior to work beginning.
Work is also taking place on Autopilot Drive near car rental agencies and police/fire facilities. Work is these areas will intensify in the spring.
Dulles Airport Construction: Girder Installation Air Freight lane.
Photo courtesy of Capital Rail Constructors
Dulles Metrorail Online
The Dulles Corridor Metrorail Project has updated online resources to better inform the public of project news. The
www.dullesmetro.com website has been redesigned to include features that give an in-depth look at each construction area along the alignment, construction news on the homepage, photos and a live Twitter feed. The site will continue to provide background on the project, its route, stations, maps, environmental studies and other reports. In addition, the Dulles Corridor Metrorail Project has launched a Twitter account, @DullesMetrorail to share construction information, project highlights and to be a resource for public inquiries.
Traction Power Network
The energy to move the rail cars on the Washington region's Metrorail system is provided by a traction power network, an electricity grid that supplies power to the rail cars. The 34.5 kV is the dedicated power line that will carry electrical current from the supply source to nine (9) Silver Line Traction Power Substations (TPSS) that will be constructed approximately one (1) mile apart, all the way down the alignment. To increase energy efficiency and utilize less electric conductor material, the electricity is transmitted at a higher voltage than the utilization
voltage.
Transformation and Power Conversion
Once the electricity reaches each TPSS, it passes through a transformer and power electronics, which step down the voltage and then convert the electricity for alternating current to direct current. It is direct current that will then power the future passenger trains via a Third Rail. Each rail car has four collector shoes that make contact with the Silver Line track's Third Rail and transfer the electricity to the cars.
Construction of the TPSS stations will begin this summer with TPSS #12 near the Reston Town Center Station site.
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Link to PDF version not yet posted at
Dulles Corridor Metrorail Project web site.