North American Joint Positive Train Control (IDOT PTC)

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Description[edit]

  • Also known as North American Joint PTC (NAJPTC) demonstration.
  • Started in 1995 with Southern Pacific, ARINC and CANAC using ATCS design.
  • Led by FRA, contracted to TTCI as client systems engineer and LMCo as supplier.
  • Wayside centric system – train profiles sent from “zone controller ” computer server, onboard database limited in scope. Digital distribution of bulletins and authorities planned.
  • Onboard equip subcontracted to Wabtec.
  • Operate standalone on prior dark territory (virtual signaling) and as overlay on CTC.
  • Intended to demonstrate vital operation with high speed passenger & freight.
  • Advanced crossing activation by ITCS and quad gates – some crossing eliminations, all to support 110 mph passenger operations.


  • SPONSOR: IDOT/FRA/UP/AMTRAK/TTCI/AAR
  • SUPPLIER(s): Lockheed Martin with Wabtec Onboard
  • STRUCTURE: ISO 7 Layer, Synchronous HDLC-LAPB
  • MESSAGING STD: ATCS 200
  • MAX BIT RATE: 9600 Bits/sec
  • FREQ BAND: VHFVery High Frequency (30-300 MHz)
  • DISTANCE RANGE: LOS
  • COMMS BETWEEN: Train to Wayside Zone Controller
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