Robin Stevens - Queensland Rail - Presentation 2 - Design location, catchpoints and junction


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Robin Stevens delivered the presentation at 2014 RISSB National Rail Turnouts Workshop.

The RISSB National Rail Turnouts Workshop gives all those involved an in-depth forum for discussion and the sharing of expertise. A key element of this workshop is participation and knowledge sharing from audience as well as the workshop leaders. It is a chance for you to bring your experience and to take away new approaches for best practice.

For more information about the event, please visit:

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Robin Stevens - Queensland Rail - Presentation 2 - Design location, catchpoints and junction

  1. 1. Robin Stevens Team Leader Track Design Queensland Rail Infrastructure location and Drainage
  2. 2. • Common Sense • Bigger Picture Overview • Working Together
  3. 3. • There is no substitute for correct turnout location & construction in attaining high long term reliability. • It is almost impossible to rectify poor design and construction via maintenance processes • Compared with other trackside or infrastructure equipment, points failures will invariably account for the greatest delays to train operations, therefore location, drainage and accessibility is critical.
  4. 4. • Basic Renewals – Need – Integration with other works – Transition opportunity – Correct existing deficiencies – Review current performance issues – Operational improvements – Technological improvements
  5. 5. • Greenfield Sites for Turnouts – Eliminate Horizontal curvatures – No Vertical Curves – Formation & Drainage – Clearances – Access
  6. 6. Result of turnout on a curve
  7. 7. • Vehicular Access – Permit a suitable hiab truck or crane to travel safely to the turnout – Access road should be weather resistant and suitable for heavy vehicles – Permit a hiab truck or crane to unload – Permit a hiab truck or crane to turn around – Allowance to pass other structures
  8. 8. The cess is not wide enough to permit vehicular access to the turnout. Small vehicles, in this case, can get close to the turnout. Larger vehicles or crane trucks can not. Access
  9. 9. Suitable access permits a hiab truck to access adjacent to the turnout, allowing new and old material to be loaded directly onto the track, thereby reducing manual handling, time and resources Well Designed Access
  10. 10. Track Access is Critical for the Installation & Maintenance of Infrastructure
  11. 11. Walkway material has been spread along the track covering the components and preventing normal inspections Walkway material has been spread over the ballast and will eventually cause ballast/formation failure by preventing water to escape. Driver Walkways
  12. 12. Note the walkway permits, for the mechanised tamping of the track Driver Walkways
  13. 13. Safe Operation of Points Level area for stable footing when operating manual lever
  14. 14. • Drainage – Loss of vertical geometry – Loss of horizontal geometry – Formation of “bog holes” and track pumping – Sleeper/Bearer failure – Rail breaks – Derailment
  15. 15. Drainage Turnout located on top of embankment
  16. 16. Drainage
  17. 17. Drainage Embankment slippage Blocked cess drains Embankment erosion Poor drainage resulting in fouled ballast and sleeper pumping
  18. 18. • Catchpoints used to intentionally derail a train rather than let it cross onto another track – Fitted at end of • Yards • Loops • Refuges • Junctions
  19. 19. • Catchpoints comprise a single switch and stockrail assembly, ramp block and throw-off rail. Ramp block Switch assembly Throw-off rail
  20. 20. Ramp block Switch assembly Throw-off rail
  21. 21. • Catchpoints design must include – Safe landing area – Clearance from main line – Account for: • Train type • Train speed • Risk to both infrastructure and personnel
  22. 22. • Catchpoint with safe landing area
  23. 23. Run out area shall provide clearance to all structures and be a minimum of two vehicles in length Catchpoint Landing Area
  24. 24. Catchpoint with Insufficient Landing Area
  25. 25. Catchpoints
  26. 26. • Catchpoints with unsafe landing area
  27. 27. Catchpoints & Structures
  28. 28. Catchpoints
  29. 29. Catchpoint Derailment Case Study
  30. 30. ? • Common Sense • Bigger Picture Overview • Designers on sites • Working Together to Achieve the Best Result