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Dulles Automated People Mover (APM) System

RailWorks installed the track system in the tunnels where the APMs will operate.
Project Highlights 
  • Coordinated design interface and construction management services
  • Constructed the vehicle running surface
  • Installed the power distribution systems
  • Installed the SCADA system, command control and communications systems
Transit & Systems
Track
Sterling, Virginia
Customer 
Metropolitan Washington Airport Authority
Business Unit 
L.K. Comstock & Company
L.K. Comstock National Transit
HSQ Technology
Project Description 

RailWorks was part of a project team to construct the Automated People Mover (APM) system at the international airport.

Project Scope 

RailWorks subsidiaries performed the following work on the six-year, design-build project:

  • Coordinated the design interface with the airport’s fixed facilities designers and the vehicle manufacturer, and provided construction management to install the APM system.
  • Designed, furnished and installed the complete power distribution systems, vehicle wash facility, intrusion detection and automatic platform doors at the stations.
  • Designed, furnished and installed the complete SCADA subsystem with redundant master stations in both the primary and alternate control facilities. The SCADA system will interface with the power distribution system, train controls, communications and security systems.
  • Designed, furnished and installed the vehicle running surface, guidance systems and emergency walkways in the tunnels, maintenance facility and storage yard. Installation included 21,000 track feet of concrete plinths within the tunnels, 23,000 feet of pre-cast and poured walkway and corresponding handrail, and 25,000 track feet of side-mounted guidance and power rail.
  • Installed the command, control and communications systems and the APM-related equipment at the facility’s four new stations.
Unique Features 

This was a challenging project primarily due to the number of subcontractors and the complexity of the work. L.K. Comstock's  work depended on completing the facility infrastructure, which was done by other contractors under a separate contract. This resulted in numerous scheduling revisions and restructuring the work sequence to progress our work as areas became available. L.K. Comstock and RailWorks Track Systems worked as a team to coordinate directly with the Authority and their contractors to mitigate much of the resulting delay.

The majority of the guideway construction was completed in a double tunnel with very little access, delayed releases and constantly evolving access scenarios under shared conditions. Extensive planning and coordination with other contractors and adaptation to changes were essential components for the success of this project. To maximize productivity, crews worked night and day to install plinth, which then served as the avenue distributing materials and installing the remaining guideway work. RailWorks installed a temporary track system throughout the tunnels and led the way for other contractors. Their installations followed RailWorks and also required use of the temporary track system.

Other Participants 
Prime contractor: Sumitomo Corp. of America (SCOA) Contract manager: Parsons Management Consultants