MWAA | Dulles Corridor Metrorail Project Phase 2, Package B: Rail Yard and Maintenance Facility

MWAA | Dulles Corridor Metrorail Project Phase 2, Package B: Rail Yard and Maintenance Facility

SYSTRA is the lead designer on the design-build team for a large rail yard and maintenance facility complex for the Metropolitan Washington Airports Authority (MWAA), in cooperation with the Washington Metropolitan Area Transit Authority (WMATA).

The overall project is the construction of the Metrorail Silver Line, bringing rail service to areas of Northern Virginia and providing a direct ride from Dulles International Airport to downtown Washington, D.C.

Phase One of the Dulles Corridor Metrorail Project opened in 2014, from the East Falls Church Station on the Orange Line, through Tysons Corner to Wiehle Avenue in Reston, VA. Phase Two, scheduled to open in 2018, will expand the line another 11.5 miles to Loudoun County via Washington Dulles International Airport and add six stations to the line. SYSTRA is providing design management for the project, and is responsible for the design quality, safety/security certification, systems integration for the design, and design services during construction. This includes shop drawing review, responses to RFIs, and site visits. SYSTRA will perform track/special trackwork, electrical traction power, and mechanical/industrial design, and support the commissioning of the project.

The yard and shops are being advanced as a design-build project with an aggressive schedule. The yard facility will incorporate four lead tracks, five shop tracks, a wash track, 16 yard storage tracks, and nine maintenance-of-way tracks. Overall, the yard will encompass 43,400 feet of track and 50 turnouts, and be able to accommodate an additional 9,300 feet of future track for storage and maintenance.

SYSTRA is responsible for design development and coordination of all aspects of the track and special trackwork, including alignments, profiles, track structure (ballasted, embedded, and direct fixation), transition slabs, posted rail for shop inspection pits, contact rail, restraining rail, track details, and track charts. There is focus on minimizing deviations from the WMATA design criteria, and preparing detailed documentation regarding deviations that cannot be avoided.

Also included is the design of two 3 MW traction power substations and all supporting traction power systems, including feeders and connections to the third rail, negative return, jumpers, sectionalizing, and contact rail heating systems to support a yard sized to store 228 vehicles. The team prepared the RAILSIM load flow model for sizing all traction power equipment and integrating operations with the Silver Line.

This project was designed to meet the requirements for LEED Silver certification.

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