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No. 7/Flushing Line CBTC Signal Modernization

Project Highlights 
  • Install a new radio dispatching system
  • Support testing and commissioning of CBTC
  • Perform track upgrades to support updated interlockings and CBTC systems
  • Upgrade six existing relay rooms and construct three new CIRs (central instrument rooms)
Transit & Systems
Queens, New York
Customer 
New York City Transit Authority, part of the Metropolitan Transit Authority
Business Unit 
L.K. Comstock & Company
RailWorks Transit
Project Description 

RailWorks' $230 million subcontract calls for performing upgrades to two interlockings and installing communication-based train control (CBTC), power and communications systems to the existing  9.4-mile Flushing Line from Times Square in Manhattan eastward to Main Street in Flushing Queens.

Project Scope 

L.K. Comstock is installing communications-based train control (CBTC) technology to be integrated on the line with existing interlocking control systems. Crews will rehabilitate the Times Square interlocking with standard signal interlocking equipment and the First Avenue interlocking with new solid state interlocking control technology. The upgraded technology will provide better train throughput with less maintenance.

The 77-month project also includes the following work:

  • Install a new radio dispatching system to improve communications between Control Towers, Remote Control Center (RCC) and train operators
  • Support testing and commissioning of CBTC
  • Perform track upgrades to support updated interlockings and CBTC systems
  • Upgrade six existing relay rooms and construct three new CIRs (central instrument rooms), including new power, HVAC, security and fire detection/suppression systems throughout.
     
Unique Features 

The project is considered a hybrid signal upgrade due to the utilization of both standard and advanced signaling technology. It features new CBTC technology that is integrated on the line with existing interlocking control systems.  The basic CBTC system utilizes wayside (track-mounted) radio and antenna units, working with train-mounted radio units and room control equipment with communication via new fiber optic backbone to form an integrated system between areas to provide train monitoring and control.

The project environment is varied with the line running 2.6 route miles underground subway construction in Manhattan and then 6.8 miles on an elevated structure after crossing the East River to its Flushing terminus at Main Street. It also includes a middle track from Queensboro Plaza to the Main Street and tie-ins to Corona Yard. The line serves 21 stations and is one of the faster growing lines in the NYCT system.

Other Participants 
Thales Transportation System – prime contractor and technology provider Alstom – standard signal designer and equipment supplier