Track Geometry – Train System Engineering Standard Rail Commissioner TC1-DOC0000448 Track Geometry – Train System: Engineering Standard DOCUMENT CONTROL Document Status Document Amendment Record REVISION CHANGE DESCRIPTION DATE PREPARED REVIEWED APPROVED 0 Initial Issue June 2020 Mark Pronk David Ogucha Mark Pronk Document Number: TC1-DOC-000448 KNet No (PDF): 15598499 Version Number: 0 KNet No (Word):5590446 Document Owner: Director, Asset Management Issue Date: June 2020 UNCONTROLLED WHEN PRINTED Page 2 of 26 Track Geometry – Train System: Engineering Standard TABLE OF CONTENTS 1. Introduction ................................................................................................................... 6 2. Purpose ......................................................................................................................... 6 3. Scope ............................................................................................................................. 6 4. References ..................................................................................................................... 6 DPTI Standards ................................................................................................... 6 DPTI Documents ................................................................................................. 6 DPTI Standard Drawings ..................................................................................... 6 Rail Industry and Australian Standards ................................................................ 7 5. Acronyms ...................................................................................................................... 7 6. Definitions ..................................................................................................................... 7 7. Horizontal and Vertical Alignment ............................................................................... 7 Horizontal Alignment Components ....................................................................... 7 7.1.1. Tangents ................................................................................................ 8 7.1.2. Transitions .............................................................................................. 8 7.1.3. Circular Curves ....................................................................................... 8 7.1.4. Compound Curves .................................................................................. 8 Vertical Alignment Components ........................................................................... 8 7.2.1. Vertical Grades ....................................................................................... 8 7.2.2. Vertical Curves ....................................................................................... 8 8. Geometry Design and Rating – General ...................................................................... 9 Design Abbreviations ........................................................................................... 9 General ................................................................................................................ 9 Desirable Design Limits ....................................................................................... 9 Recommended Design Limits .............................................................................. 9 Maximum (or Minimum) Design Limits ................................................................. 9 Track Gauge ...................................................................................................... 10 Tangent Track ................................................................................................... 10 Vertical Gradients .............................................................................................. 10 Curve Compensation ......................................................................................... 10 Vertical Curves in Hogs and Sags ...................................................................... 11 Lengths of Horizontal Straights and Curves ....................................................... 12 Cant and Speed - Explanation ........................................................................... 12 Cant Related Definitions .................................................................................... 13 8.13.1. Cant ...................................................................................................... 13 8.13.2. Design Cant .......................................................................................... 13 8.13.3. Applied Cant ......................................................................................... 13 Document Number: TC1-DOC-000448 KNet No (PDF): 15598499 Version Number: 0 KNet No (Word):5590446 Document Owner: Director, Asset Management Issue Date: June 2020 UNCONTROLLED WHEN PRINTED Page 3 of 26 Track Geometry – Train System: Engineering Standard 8.13.4. Actual Cant ........................................................................................... 13 8.13.5. Cross Level ........................................................................................... 13 8.13.6. Equilibrium Cant ................................................................................... 13 8.13.7. Cant Deficiency .................................................................................... 13 8.13.8. Excess Cant ......................................................................................... 14 8.13.9. Negative Cant ....................................................................................... 14 8.13.10. Cant Ramp ........................................................................................... 14 8.13.11. Cant Gradient ....................................................................................... 14 8.13.12. Rate of Change of Cant ........................................................................ 14 8.13.13. Rate of Change of Cant Deficiency ....................................................... 14 9. Geometry Design and Rating ..................................................................................... 14 Limit Values of Track Parameters ...................................................................... 14 Horizontal Curves .............................................................................................. 16 9.2.1. Minimum Radius - Platforms ................................................................. 16 9.2.2. Cant and Speed Requirements ............................................................. 16 9.2.3. Maximum allowable Applied Cant and Cant Deficiency ........................ 16 9.2.4. Cant/Speed Relationship ...................................................................... 16 Bends ................................................................................................................ 17 9.3.1. Occurrence of Bends ............................................................................ 17 9.3.2. Maximum Allowable Speed through Bends ........................................... 17 Transitions ......................................................................................................... 17 9.4.1. Standard Transitions ............................................................................. 18 9.4.2. Transitions of Restricted Lengths .......................................................... 18 9.4.3. Curves Without Transitions and Virtual Transitions ............................... 18 9.4.4. Compound Curves ................................................................................ 20 9.4.5. Reverse Curve ...................................................................................... 21 9.4.6. Curves of Restricted Cant ..................................................................... 21 Points and Crossings ......................................................................................... 21 10. Track Geometry Requirements for Construction ...................................................... 22 New Construction Tolerances – Ballasted Track ................................................ 22 Re-used Material Construction Tolerances – Ballasted Track ............................ 22 New Construction Tolerances – Fixed Track ...................................................... 22 11. Track Monumenting .................................................................................................... 24 12. Geometry Design Requirements for Alignments at Platforms ................................. 24 New Corridor Design ......................................................................................... 24 New Platform or Trackwork within an Existing Corridor – Desirable Limits ......... 25 New Platform or Trackwork within an Existing Corridor – Maximum (or Minimum) Limits .......................................................................................................................... 25 Document Number: TC1-DOC-000448 KNet No (PDF): 15598499 Version Number: 0 KNet No (Word):5590446 Document Owner: Director, Asset Management Issue Date: June 2020 UNCONTROLLED WHEN PRINTED Page 4 of 26 Track Geometry – Train System: Engineering Standard Temporary Platforms ......................................................................................... 25 13. Design Documentation ............................................................................................... 25 General .............................................................................................................