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ARRC Collision Avoidance System. 2005 ASME/IEEE Joint Rail Conference March 16-18, 2005 Presented by Chinnarao Mokkapati Robert D. Pascoe Union Switch & Signal Inc. Alaska Rail Road Facts (2003 Data). Employees 722 Year-round 10.8 average years of service 43.2 average age

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ARRC Collision Avoidance System

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ARRC Collision Avoidance System

2005 ASME/IEEE Joint Rail Conference

March 16-18, 2005

Presented by

Chinnarao Mokkapati

Robert D. Pascoe

Union Switch & Signal Inc.


Alaska Rail Road Facts (2003 Data)

  • Employees

    • 722 Year-round

    • 10.8 average years of service

    • 43.2 average age

  • Operating Statistics

    • 446,162 Passenger ridership

    • 8,324,395 Freight tonnage

    • 102,292 Revenue car loads

  • Trains per day

    • 33 Freights

    • 14 Passenger - Summer

    • 1 Passenger - Winter

  • Operating Data

    • Miles of track

      • 466 main line

      • 59 branch line

      • 86 yards/sidings

      • 611 Total

  • Rolling Stock

    • 1,625 Freight cars

    • 42 Passenger cars

    • 60 Locomotives

  • Train Control

    • ~500 miles of DTC

    • ~30 miles of CTC


ARRC CAS Objectives

  • PREVENT TRAIN TO TRAIN COLLISIONS BY ENFORCEMENT OF AUTHORITY LIMITS

  • ENFORCE SPEED RESTRICTIONS

  • PROVIDE PROTECTION FOR ROADWAY WORKERS AND EQUIPMENT

  • IMPROVE EFFICIENCY OF OPERATIONS

  • INCREASE CAPACITY


FRA Requirements

  • Generation of safe mandatory directives

  • Enforcement of authority limits

  • Enforcement of speed restrictions

  • Protection of Maintenance-of-Way workers and equipment

  • Rule 236 Subpart H compliance required

  • Performance Std: New system must be as safe or safer than the system being replaced

    • Operating conditions, parameters, constraints must be defined

    • Structured qualitative and quantitative assessment of safety (Base Case and New Case) required

      • Product Safety Plan or Safety Case


Some Definitions

CTC and DTC Operation


Some Definitions

Track Bulletins Used in System


Collision Avoidance System


Block 5

Block 9

(( ))

Existing

Comms

Block 6

Block 3

Block 7

Block 11

OSS

Dispatcher

Work

Stations

Servers

CAD

Vital

Independent

Check of

LOA, Bulletins

General Philosophy of CAD and OSS Subsystems

Track


  • Vital Checks Done by OSS

  • Via the OBC, the position of all trains are known to the OSS

  • ‘Occupies’ Virtual blocks

  • ‘un-occupies’ Virtual blocks

  • Checks Bulletins associated with Blocks & LOA


Network

Interface

Adapter

CAD Subsystem

Ethernet Switch

Ethernet

RS423

Microlok II

Microlok II

RS423

HUB

RS423

RS423

RS423

Microlok II

Microlok II

OSS Hub Physical Architecture


Block 6

Block 1

Block 3

Block 5

Block 7

Block 9

Block 11

Block 13

S#7

S#5

Software in MicroLok II Units

North

  • Executive Software

  • Operating System

  • Application Processing

  • Serial Communications Control

  • Safety Diagnostics

  • User Interfaces

  • Event Logging

  • Application Data Tables

  • Track Sections defined as Virtual Blocks

  • Switch locations

  • Other identifiable points


  • OBC Requirements:

  • Profile Generation

  • Train Location and Speed Determination

  • Digital Track Data Map

  • Communication via Digital Radio


LOCATION AND SPEED DETERMINATION

  • DGPS

  • Accelerometers

  • Tachometers

  • Digital Map

The result is that the OBC vitally

determines its location on the rails

and transmits its location to Central


New On Board Computer (OBC) - ATP


Existing Network Communication System


Communication Backbone


MONITORING DEVICES

Rail Integrity

Switch Position

Signal Aspect in CTC


Short Range

Data Radio

Locomotive

Broken rail

Device

Short Range

Data Radio

N

R

Locomotive

Device

Short Range

Data Radio

Aspect

Locomotive

Device

  • The Locomotive’s ATP Interrogates Three Wayside Devices

  • using a short range data radio:

  • A Rail Integrity Device

    • Broken Rail Detection

    • MicroTrax

  • A Switch Position Device

    • Normal or Reverse

  • A Wayside Signal Device

    • Aspect


  • CAS Safety Assurance

    • Safety resides in OSS and OBC, though CAD performs some safety-related functions

    • OSS is implemented on US&S MICROLOK II Platform

    • OBC implemented on US&S MICROCAB Platform

    • These platforms use a combination of Inherent Fail-Safety and Diversity & Self-Checking safety architectures

    • Certified by independent safety assessors

    • Extensive service history


    CAS Safety Assurance

    • Compliance with FRA Rule 236 Subpart H

    • Risk analysis of CAD-only DTC/CTC Operation (Base Case)

    • Derive safety requirements for CAS

    • V&V of CAS design and operation

    • Risk analysis of CAS (CAS Case)

    • Risk assessment

      • Show CAS provides higher safety than CAD-only DTC/CTC operation


    Risk Analysis

    • Conduct Hazard Analyses

      • PHA

      • O&SHASSHA

    • Determine MTTHE using FFTA


    Derive safety requirements for CAS

    • Potential hazards in Base Case

    • FFTA of CAS elements

    • CAS subsystem safety requirements


    V&V of CAS design and operation

    • Normal operation

    • Systematic faults

    • Random hardware faults

    • Common Mode faults

    • External influences


    Risk analysis of CAS (CAS Case)

    • Conduct Hazard Analyses

      • PHA

      • O&SHASSHA

    • Determine MTTHE using FFTA


    Risk Assessment

    • Show CAS provides higher safety than CAD-only DTC/CTC operation

    • Submit PSP

      • 20 elements required per FRA Rule 236.907


    4/16/2005

    -

    10/16/2005

    4/15/2006

    -

    10/15/2006

    2005Peak Season

    2006 Peak Season

    2005

    2006

    2007

    11 / 2005

    CAD SAT

    Complete

    06 / 2006

    Office Safety and OBC FAT

    4Q 2004

    System

    Definition

    Complete

    10 / 2006

    Office Safety and OBC

    SAT

    1 / 2006

    CAD Cutover

    complete

    2 / 2007

    Revenue Service

    Project Timeline


    Conclusions

    • CAS is a practical, relatively inexpensive PTC System

    • Scalable for larger systems

    • Uses proven safety architectures

    • Credible, straight-forward safety proof


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