1. Welcome Train Protection & Warning System (TPWS) Version 1.3 February 2011 21 Apr 2011

7. Cab Equipment & Indications

8. 21 Apr 2011 21 Apr 2011 What colour is this indicator? What colour is this indicator? What colour is this indicator?

9. 21 Apr 2011 21 Apr 2011 Which of the above are also a push button?

10. 21 Apr 2011 21 Apr 2011 What is the name of this indicator?

11. 21 Apr 2011 21 Apr 2011 What is the name of this indicator?

12. 21 Apr 2011 21 Apr 2011 What is the name of this indicator?

13. 21 Apr 2011 21 Apr 2011 Which of these indicators can flash?

14. 21 Apr 2011 21 Apr 2011 When will the “Temporary Isolation/Fault” indicator flash?

15. 21 Apr 2011 21 Apr 2011 The “Temporary Isolation/Fault” indicator flashes to indicate a fault with the TPWS system.

16. 21 Apr 2011 21 Apr 2011 When does the “Temporary Isolation/Fault” indicator illuminate steady?

17. 21 Apr 2011 21 Apr 2011 The “Temporary Isolation/Fault” indicator illuminates steady when the TPWS has been Temporarily Isolated.

18. What must a Driver do if they have been given authority to pass a signal at danger that is fitted with TPWS equipment? Press the “Train Stop Override” button

19. 21 Apr 2011 21 Apr 2011 What happens when a Driver presses the “Train Stop Override” button?

20. 21 Apr 2011 21 Apr 2011 This button temporarily de-energises the train TPWS equipment for 20 seconds allowing a train to pass over an energised TPWS Train Stop Loop without initiating a brake demand. The indicator will remain lit for 20 seconds, or until the train has passed over the Train Stop Loop.

21. 21 Apr 2011 21 Apr 2011 If a Driver was to press the ‘Train Stop Override’ button again after 10 seconds would this de-energise the train TPWS equipment for a further 20 seconds?

22. 21 Apr 2011 21 Apr 2011 No - once pressed the TPWS equipment would timeout after 20 seconds. The “Train Stop Override button would then need to be pushed again if the train had not yet passed over the Train Stop Loop.

23. 21 Apr 2011 21 Apr 2011 If a train travelled over a TPWS overspeed sensor too fast what indication will be seen?

24. 21 Apr 2011 21 Apr 2011 The brake demand light will flash and the emergency brakes will apply.

25. 21 Apr 2011 21 Apr 2011 What audible sound, associated with the TPWS will the Driver receive in the cab?

26. 21 Apr 2011 21 Apr 2011 There are NO audible sounds associated with TPWS.

27. 21 Apr 2011 21 Apr 2011 The brakes have applied for no apparent reason and the Brake Demand Light is flashing. What are your actions?

29. 21 Apr 2011 21 Apr 2011 Why is it important to apply the brakes?

30. 21 Apr 2011 21 Apr 2011 Whilst communicating with the signaller it is possible you might have acknowledged the Brake Demand and after 60 seconds the brakes will release. The train could then start rolling. If the brake demand was at an overspeed sensor you may now be rolling towards a signal at danger.

31. 21 Apr 2011 21 Apr 2011 How does a Driver reset/acknowledge a TPWS brake demand?

32. 21 Apr 2011 21 Apr 2011 The Driver must acknowledge the brake demand by pressing the AWS reset button.

33. 21 Apr 2011 21 Apr 2011 What happens when the Driver presses and releases the AWS reset button?

34. 21 Apr 2011 21 Apr 2011 The brake demand indictor will stop flashing and illuminate steady and the brakes will remain applied until the system times out.

35. 21 Apr 2011 21 Apr 2011 How long does the Brake Demand light remain illuminated for & how long will the brakes remain applied?

36. 21 Apr 2011 21 Apr 2011 The brakes will release and the brake demand light will go out 60 seconds after the ‘brake demand was initiated’ providing that the AWS/TPWS reset button is pressed at any point during the 60 second period.

37. 21 Apr 2011 21 Apr 2011 What happens if the driver fails to notice the brake demand light flashing until after 60 seconds has elapsed from the time of the brake application initiated by TPWS?

38. 21 Apr 2011 21 Apr 2011 On pressing and releasing the AWS/TPWS reset button, the brake demand light will change momentarily to steady red, all TPWS indications will clear and the brakes will release immediately.

39. 21 Apr 2011 21 Apr 2011 Why is it important for a driver to know that they have experienced a TPWS intervention or activation?

41. 21 Apr 2011 21 Apr 2011 What is the difference between a TPWS activation and a TPWS intervention?

44. 21 Apr 2011 21 Apr 2011 When do the rules permit a Driver to move the train without the Signallers authority after receiving a TPWS Brake Demand?

45. 21 Apr 2011 21 Apr 2011 The only occasion a Driver may proceed before reporting a TPWS Brake Demand is when they are approaching buffer stops.

46. 21 Apr 2011 21 Apr 2011 After moving forward to the buffer stops to the correct stopping position what should the Drivers actions be?

48. 21 Apr 2011 21 Apr 2011 What are the risks if after a Brake Demand (other than at buffer stops), the Driver continues without reporting the circumstances to the Signaller?

49. 21 Apr 2011 21 Apr 2011 The train might already have been involved in a SPAD. By resetting and continuing you could be heading towards a conflict point, even if the signal ahead is showing a proceed aspect! Signal Points

51. 21 Apr 2011 21 Apr 2011 If the ‘Temporary Isolation/Fault’ indicator was flashing what has happened?

52. 21 Apr 2011 21 Apr 2011 The system has developed a fault. If faced with this scenario what would be your actions?

54. 21 Apr 2011 21 Apr 2011 At some locations, when changing ends the ‘Temporary Isolation/Fault’ indicator might flash when livening up the cab Why might this be?

55. 21 Apr 2011 21 Apr 2011 If the train has stopped at the incorrect stopping point, when changing ends the train TPWS equipment may be over the track TPWS equipment? What are the correct actions in this scenario?

57. 21 Apr 2011 21 Apr 2011 Inform the Signaller what you suspect the problem is. Get permission to move the train forward for a short distance. Deactivate and then reactivate the cab. The indicator should no longer be flashing.

58. 21 Apr 2011 21 Apr 2011 If you are unable to gets the brakes released in this scenario what are your actions?

59. 21 Apr 2011 21 Apr 2011 Temporary isolate, move the train forward for a short distance. Deactivate and then reactivate the cab. The indicator should no longer be flashing.

60. 21 Apr 2011 21 Apr 2011 If you had to leave the TPWS Temporarily Isolated, what rules apply?

61. TPWS Temporary Isolation switch 21 Apr 2011 21 Apr 2011 Inform the Signaller immediately Temporary isolate the TPWS (The AWS function is not affected) Once isolated the following speeds apply :- No competent person = 40 mph With competent person = Line speed Degraded Working During TBW = 50 mph Poor visibility conditions (with or without competent person) = 40 mph The train may continue in service only if the line to be worked over is not fitted with TPWS. If a FULL isolation of the TPWS is necessary the train is not permitted to remain in service and must be dealt with in accordance with the DOTE contingency plan. Full isolation of the TPWS also isolates the AWS Tip! The AWS & TPWS are external devices and may be affected by the weather. Vigilance and DSD are internal devices and are not affected by the weather

63. 21 Apr 2011 21 Apr 2011 We have discussed how we temporary isolate the TPWS system, however how do we fully isolate system?

64. 21 Apr 2011 21 Apr 2011 FULL isolation of the TPWS equipment is achieved by isolating the AWS, hence the reason why you lose your AWS

65. 21 Apr 2011 21 Apr 2011 During preparation and when livening up the cab what should you check in respect of the TPWS panel and why?

67. 21 Apr 2011 21 Apr 2011 You liven up the cab and turn the control key what should happen next?

68. 21 Apr 2011 21 Apr 2011 The AWS warning horn (klaxon) sounds and all three TPWS indicators should remain lit until the AWS reset button is pressed & released.

69. 21 Apr 2011 21 Apr 2011 After pressing the AWS reset button. What should happen to the three lit indicators and are you expecting any other sound?

70. 21 Apr 2011 21 Apr 2011 All three indicators are no longer lit up and the AWS clear indication (bell/ping) should be heard.

71. 21 Apr 2011 21 Apr 2011 This now completes the TPWS check process. Drivers often do not hear the AWS clear indication. This is because the AWS reset is pushed almost immediately and the CSR radio sounds at the same time. It is good practice whilst checking the equipment to allow the AWS warning horn to sound for at least 2 seconds before pressing the AWS reset button.

72. 21 Apr 2011 21 Apr 2011 If all or any of the indicators fail to light, remain lit or flash, deactivate and then reactivate the cab. Try this up to 3 times. The TPWS must be temporarily isolated if this fails to solve the problem. The train must not enter service if it is to be worked over a line fitted with TPWS.

73. Positions of TPWS Equipment

77. TPWS + example 21 Apr 2011

83. Welcome Any Questions? 21 Apr 2011