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Welcome Train Protection & Warning System (TPWS) Version 1.3 February 2011   21 Apr 2011
<ul><li>Note! </li></ul><ul><li>This presentation may not be accurate for all operators. You should refer to the rule book...
Objectives <ul><li>The purpose of this presentation is to explain: </li></ul><ul><ul><li>why TPWS was implemented </li></u...
Why TPWS <ul><li>Following the decision in 1994 by BR not to fit Automatic Train Protection (ATP) across the railway netwo...
Introduction of TPWS <ul><li>Since fitment on the TPWS system in 2001 SPaD risk has reduced by nearly 85%  </li></ul><ul><...
Test Your knowledge <ul><li>Is TPWS fitted at all signals? </li></ul><ul><li>No </li></ul><ul><li>Will TPWS always stop a ...
Cab Equipment & Indications
21 Apr 2011 21 Apr 2011 What colour is this indicator? What colour is this indicator? What colour is this indicator?
21 Apr 2011 21 Apr 2011 Which of the above are also a push button?
21 Apr 2011 21 Apr 2011 What is the name of this indicator?
21 Apr 2011 21 Apr 2011 What is the name of this indicator?
21 Apr 2011 21 Apr 2011 What is the name of this indicator?
21 Apr 2011 21 Apr 2011 Which of these indicators can flash?
21 Apr 2011 21 Apr 2011 When will the “Temporary Isolation/Fault” indicator flash?
21 Apr 2011 21 Apr 2011 The “Temporary Isolation/Fault” indicator flashes to indicate a fault with the TPWS system.
21 Apr 2011 21 Apr 2011 When does the “Temporary Isolation/Fault” indicator illuminate steady?
21 Apr 2011 21 Apr 2011 The “Temporary Isolation/Fault” indicator illuminates steady when the TPWS has been Temporarily Is...
What must a Driver do if they have been given authority to pass a signal at danger that is fitted with TPWS equipment? Pre...
21 Apr 2011 21 Apr 2011 What happens when a Driver presses the “Train Stop Override” button?
21 Apr 2011 21 Apr 2011 This button temporarily de-energises the train TPWS equipment for 20 seconds allowing a train to p...
21 Apr 2011 21 Apr 2011 If a Driver was to press the ‘Train Stop Override’ button again after 10 seconds would this de-ene...
21 Apr 2011 21 Apr 2011 No - once pressed the TPWS equipment would timeout after 20 seconds. The “Train Stop Override butt...
21 Apr 2011 21 Apr 2011 If a train   travelled over a TPWS overspeed sensor too fast what indication will be seen?
21 Apr 2011 21 Apr 2011 The brake demand light will flash and the emergency brakes will apply.
21 Apr 2011 21 Apr 2011 What audible sound, associated with the TPWS will the Driver receive in the cab?
21 Apr 2011 21 Apr 2011 There are  NO  audible sounds associated with TPWS.
21 Apr 2011 21 Apr 2011 The brakes have applied for no apparent reason and the Brake Demand Light is flashing. What are yo...
21 Apr 2011 21 Apr 2011 Apply the brakes and report the circumstances to the signaller immediately. <ul><li>Brake applicat...
21 Apr 2011 21 Apr 2011 Why is it important to apply the brakes?
21 Apr 2011 21 Apr 2011 Whilst communicating with the signaller it is possible you might have acknowledged the Brake Deman...
21 Apr 2011 21 Apr 2011 How does a Driver reset/acknowledge a TPWS brake demand?
21 Apr 2011 21 Apr 2011 The Driver must acknowledge the brake demand by pressing the AWS reset button.
21 Apr 2011 21 Apr 2011 What happens when the Driver presses and releases the AWS reset button?
21 Apr 2011 21 Apr 2011 The brake demand indictor will stop flashing and illuminate steady and the brakes will remain appl...
21 Apr 2011 21 Apr 2011 How long does the Brake Demand light remain illuminated for & how long will the brakes remain appl...
21 Apr 2011 21 Apr 2011 The brakes will release and the brake demand light will go out 60 seconds after the ‘brake demand ...
21 Apr 2011 21 Apr 2011 What happens if the driver fails to notice the brake demand light flashing until after 60 seconds ...
21 Apr 2011 21 Apr 2011 On pressing and releasing the AWS/TPWS reset button, the brake demand light will change momentaril...
21 Apr 2011 21 Apr 2011 Why is it important for a driver to know that they have experienced a TPWS intervention or activat...
<ul><li>If a driver failed to notice the brake demand light flashing and they subconsciously reset the equipment after the...
21 Apr 2011 21 Apr 2011 What is the difference between a TPWS activation and a TPWS intervention?
TPWS Activation <ul><li>This occurs when a driver has already applied the brakes before the TPWS operates. For example: </...
TPWS Intervention <ul><li>A TPWS intervention occurs when the TPWS applies the brakes in the absence of (or prior to) the ...
21 Apr 2011 21 Apr 2011 When do the rules permit a Driver to move the train without the Signallers authority after receivi...
21 Apr 2011 21 Apr 2011 The only occasion a Driver may proceed before reporting a TPWS Brake Demand is when they are appro...
21 Apr 2011 21 Apr 2011 After moving forward to the buffer stops to the correct stopping position what should the Drivers ...
21 Apr 2011 21 Apr 2011 <ul><ul><ul><li>DO NOT MOVE YOUR TRAIN </li></ul></ul></ul><ul><ul><ul><li>Report the incident to ...
21 Apr 2011 21 Apr 2011 What are the risks if after a Brake Demand (other than at buffer stops), the Driver continues with...
21 Apr 2011 21 Apr 2011 The train might already have been involved in a SPAD. By resetting and continuing you could be hea...
<ul><li>There have been 34 TPWS reset and continue events following a SPaD since fitment of TPWS in 2001. The driver had a...
21 Apr 2011 21 Apr 2011 If the ‘Temporary Isolation/Fault’ indicator was flashing what has happened?
21 Apr 2011 21 Apr 2011 The system has developed a fault. If faced with this scenario what would be your actions?
21 Apr 2011 21 Apr 2011 <ul><li>You must: - </li></ul><ul><ul><li>stop the train  immediately </li></ul></ul><ul><ul><li>r...
21 Apr 2011 21 Apr 2011 At some locations, when changing ends the ‘Temporary Isolation/Fault’ indicator might flash when l...
21 Apr 2011 21 Apr 2011 If the train has stopped at the incorrect stopping point, when changing ends the train TPWS equipm...
21 Apr 2011 21 Apr 2011 <ul><li>You must: - </li></ul><ul><ul><li>stop the train  immediately </li></ul></ul><ul><ul><li>r...
21 Apr 2011 21 Apr 2011 Inform the Signaller what you suspect the problem is. Get permission to move the train forward for...
21 Apr 2011 21 Apr 2011 If you are unable to gets the brakes released in this scenario what are your actions?
21 Apr 2011 21 Apr 2011 Temporary isolate, move the train forward for a short distance. Deactivate and then reactivate the...
21 Apr 2011 21 Apr 2011 If you had to leave the TPWS Temporarily Isolated, what rules apply?
TPWS Temporary Isolation switch 21 Apr 2011 21 Apr 2011 Inform the Signaller immediately Temporary isolate the TPWS (The A...
<ul><li>What is the main risk if the TPWS has been temporary isolated during TBW? </li></ul><ul><li>Forgetting to reset th...
21 Apr 2011 21 Apr 2011 We have discussed how we temporary isolate the TPWS system, however how do we fully isolate system?
21 Apr 2011 21 Apr 2011 FULL isolation of the TPWS equipment is achieved by isolating the AWS, hence the reason why you lo...
21 Apr 2011 21 Apr 2011 During preparation and when livening up the cab what should you check in respect of the TPWS panel...
<ul><li>Checking that the system is fully operable </li></ul><ul><li>Imagine if the Brake Demand light bulb had blown and ...
21 Apr 2011 21 Apr 2011 You liven up the cab and turn the control key what should happen next?
21 Apr 2011 21 Apr 2011 The AWS warning horn (klaxon) sounds and all three TPWS indicators should remain lit until the AWS...
21 Apr 2011 21 Apr 2011 After pressing the AWS reset button. What should happen to the three lit indicators and are you ex...
21 Apr 2011 21 Apr 2011 All three indicators are no longer lit up and the AWS clear indication (bell/ping) should be heard.
21 Apr 2011 21 Apr 2011 This now completes the TPWS check process. Drivers often do not hear the AWS clear indication. Thi...
21 Apr 2011 21 Apr 2011 If all or any of the indicators fail to light, remain lit or flash, deactivate and then reactivate...
Positions of TPWS Equipment
<ul><li>Overspeed Loop </li></ul>Example, Position of TPWS Equipment 21 Apr 2011 Arming Loop Trigger Loop <ul><li>Overspee...
<ul><li>Can a Train Captain/Guard/Conductor act as your competent person during an isolation of the TPWS? </li></ul><ul><l...
<ul><li>What is TPWS + (plus)? </li></ul><ul><li>The original TPWS design is only effective in stopping a train in the ove...
TPWS + example 21 Apr 2011
<ul><li>The train passes over the AWS magnet which requires an acknowledgement. The driver takes approximately 2 to 3 seco...
<ul><li>Why have the brakes applied and why did the AWS klaxon not sound? </li></ul><ul><li>In this scenario a TPWS activa...
<ul><li>Is this a TPWS activation/intervention or late acknowledgement of an AWS warning? </li></ul><ul><li>In this scenar...
<ul><li>What has occurred here? </li></ul><ul><li>In this scenario a TPWS activation/intervention caused the Brake Demand....
Summary <ul><li>In summary, TPWS has been very effective at reducing SPaD risk but it has some design limitations. Remaini...
Welcome Any Questions? 21 Apr 2011
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Tpws february 2011-20110215095030

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Tpws february 2011-20110215095030

  1. 1. Welcome Train Protection & Warning System (TPWS) Version 1.3 February 2011 21 Apr 2011
  2. 2. <ul><li>Note! </li></ul><ul><li>This presentation may not be accurate for all operators. You should refer to the rule book and traction manuals regarding rules and regulations concerning the TPWS equipment. </li></ul>
  3. 3. Objectives <ul><li>The purpose of this presentation is to explain: </li></ul><ul><ul><li>why TPWS was implemented </li></ul></ul><ul><ul><li>the TPWS equipment and how it works </li></ul></ul><ul><ul><li>the rules and procedures associated with TPWS </li></ul></ul><ul><ul><li>the difference between AWS & TPWS activations </li></ul></ul><ul><ul><li>the difference between TPWS activations & interventions </li></ul></ul>
  4. 4. Why TPWS <ul><li>Following the decision in 1994 by BR not to fit Automatic Train Protection (ATP) across the railway network, the former Railtrack (now Network Rail) set up a project to examine alternative ways of preventing and reducing SPADs, including a more cost-effective method of providing train protection. </li></ul><ul><li>An output of this work stream was the development of the Train Protection & Warning System (TPWS) which was initially trialled in 1997/98. </li></ul><ul><li>Fitment of TPWS was subsequently accelerated post the Ladbroke Grove Rail accident (1999) under regulatory requirements, with the fitment programme being completed during 2003. </li></ul><ul><li>It was originally envisaged that some 20% of signals would be fitted, primarily those protecting junctions and points of conflict (i.e. those presenting the greatest risk). However, as the work progressed, there was pressure to increase the number of fitments, resulting in 42% of all running signals being equipped, along with certain reductions in permissible speed and buffer stops. </li></ul>
  5. 5. Introduction of TPWS <ul><li>Since fitment on the TPWS system in 2001 SPaD risk has reduced by nearly 85% </li></ul><ul><li>However? </li></ul><ul><li>- there have been 33 TPWS reset and continue events following a SPaD </li></ul><ul><li>- incidents where the TPWS system has not been verified correctly on preparation </li></ul>
  6. 6. Test Your knowledge <ul><li>Is TPWS fitted at all signals? </li></ul><ul><li>No </li></ul><ul><li>Will TPWS always stop a train having a SPaD? </li></ul><ul><li>No, it may do so but it is designed to stop the train in the overlap of the signal </li></ul><ul><li>Does TPWS stop a train before a conflict point? </li></ul><ul><li>No, it does not because TPWS does not take into account events such as the lack of brake force due to different types of traction, low adhesion, application of defensive driving, degraded brake isolation etc </li></ul><ul><li>Should TPWS interfere with a drivers driving technique? No, if a driver is driving within their company driving policy guidelines then TPWS should not normally intervene </li></ul>
  7. 7. Cab Equipment & Indications
  8. 8. 21 Apr 2011 21 Apr 2011 What colour is this indicator? What colour is this indicator? What colour is this indicator?
  9. 9. 21 Apr 2011 21 Apr 2011 Which of the above are also a push button?
  10. 10. 21 Apr 2011 21 Apr 2011 What is the name of this indicator?
  11. 11. 21 Apr 2011 21 Apr 2011 What is the name of this indicator?
  12. 12. 21 Apr 2011 21 Apr 2011 What is the name of this indicator?
  13. 13. 21 Apr 2011 21 Apr 2011 Which of these indicators can flash?
  14. 14. 21 Apr 2011 21 Apr 2011 When will the “Temporary Isolation/Fault” indicator flash?
  15. 15. 21 Apr 2011 21 Apr 2011 The “Temporary Isolation/Fault” indicator flashes to indicate a fault with the TPWS system.
  16. 16. 21 Apr 2011 21 Apr 2011 When does the “Temporary Isolation/Fault” indicator illuminate steady?
  17. 17. 21 Apr 2011 21 Apr 2011 The “Temporary Isolation/Fault” indicator illuminates steady when the TPWS has been Temporarily Isolated.
  18. 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. 19. 21 Apr 2011 21 Apr 2011 What happens when a Driver presses the “Train Stop Override” button?
  20. 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. 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. 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. 23. 21 Apr 2011 21 Apr 2011 If a train travelled over a TPWS overspeed sensor too fast what indication will be seen?
  24. 24. 21 Apr 2011 21 Apr 2011 The brake demand light will flash and the emergency brakes will apply.
  25. 25. 21 Apr 2011 21 Apr 2011 What audible sound, associated with the TPWS will the Driver receive in the cab?
  26. 26. 21 Apr 2011 21 Apr 2011 There are NO audible sounds associated with TPWS.
  27. 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?
  28. 28. 21 Apr 2011 21 Apr 2011 Apply the brakes and report the circumstances to the signaller immediately. <ul><li>Brake application not initiated by the driver </li></ul><ul><li>Check the TPWS Brake Demand Light </li></ul><ul><li>If brake demand light is illuminated </li></ul><ul><ul><ul><li>DO NOT MOVE YOUR TRAIN </li></ul></ul></ul><ul><ul><ul><li>Report the incident to the Signaller immediately </li></ul></ul></ul><ul><ul><ul><li>Act in accordance with the instruction given </li></ul></ul></ul><ul><ul><ul><li>Make no further movement until instructed to do so </li></ul></ul></ul>
  29. 29. 21 Apr 2011 21 Apr 2011 Why is it important to apply the brakes?
  30. 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. 31. 21 Apr 2011 21 Apr 2011 How does a Driver reset/acknowledge a TPWS brake demand?
  32. 32. 21 Apr 2011 21 Apr 2011 The Driver must acknowledge the brake demand by pressing the AWS reset button.
  33. 33. 21 Apr 2011 21 Apr 2011 What happens when the Driver presses and releases the AWS reset button?
  34. 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. 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. 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. 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. 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. 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?
  40. 40. <ul><li>If a driver failed to notice the brake demand light flashing and they subconsciously reset the equipment after the 60 second TPWS time-out period, as all TPWS indications will be lost, the driver may mistakenly think the brake application was caused for another reason. </li></ul><ul><li>If the driver then proceeded without obtaining the signaller’s permission, the protection afforded by TPWS will be lost and they could even be on a collision course with another train! </li></ul><ul><li>A TPWS reset and continue event would also have occurred. </li></ul>
  41. 41. 21 Apr 2011 21 Apr 2011 What is the difference between a TPWS activation and a TPWS intervention?
  42. 42. TPWS Activation <ul><li>This occurs when a driver has already applied the brakes before the TPWS operates. For example: </li></ul><ul><ul><li>A driver might already be braking on the approach to a red signal, but still passes over the overspeed sensor too quickly, resulting in an activation. </li></ul></ul><ul><li>In the above example, if the train SPaDs the signal, this is still classified as an ‘activation’ as the driver had initially applied the brake prior to the TPWS. </li></ul><ul><li>In short the safety system ‘activates’ to back up the driver’s brake application. </li></ul>
  43. 43. TPWS Intervention <ul><li>A TPWS intervention occurs when the TPWS applies the brakes in the absence of (or prior to) the driver doing so. For example: </li></ul><ul><ul><li>A train starting against a TPWS-fitted signal at danger without authority will result in an intervention when the train passes the signal. </li></ul></ul><ul><ul><li>A driver taking no action to apply the brake on approaching a signal at danger and passing over the overspeed loops too quickly will also result in an intervention. </li></ul></ul><ul><li>In short the safety system ‘intervenes’ as the driver has not taken the appropriate action. </li></ul>
  44. 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. 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. 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?
  47. 47. 21 Apr 2011 21 Apr 2011 <ul><ul><ul><li>DO NOT MOVE YOUR TRAIN </li></ul></ul></ul><ul><ul><ul><li>Report the incident to the Signaller immediately </li></ul></ul></ul><ul><ul><ul><li>Act in accordance with the instruction given </li></ul></ul></ul><ul><ul><ul><li>Make no further movement until instructed to do so </li></ul></ul></ul>
  48. 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. 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
  50. 50. <ul><li>There have been 34 TPWS reset and continue events following a SPaD since fitment of TPWS in 2001. The driver had a SPaD and did not realise. </li></ul>
  51. 51. 21 Apr 2011 21 Apr 2011 If the ‘Temporary Isolation/Fault’ indicator was flashing what has happened?
  52. 52. 21 Apr 2011 21 Apr 2011 The system has developed a fault. If faced with this scenario what would be your actions?
  53. 53. 21 Apr 2011 21 Apr 2011 <ul><li>You must: - </li></ul><ul><ul><li>stop the train immediately </li></ul></ul><ul><ul><li>report the circumstances to the Signaller </li></ul></ul><ul><ul><li>not move the train until instructed to do so </li></ul></ul><ul><ul><li>act in accordance with the instructions you are given </li></ul></ul><ul><ul><li>complete form RT3185 </li></ul></ul>
  54. 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. 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?
  56. 56. 21 Apr 2011 21 Apr 2011 <ul><li>You must: - </li></ul><ul><ul><li>stop the train immediately </li></ul></ul><ul><ul><li>report the circumstances to the Signaller </li></ul></ul><ul><ul><li>Do not move the train until instructed to do so </li></ul></ul><ul><ul><li>act in accordance with the instructions you are given </li></ul></ul><ul><ul><li>complete form RT3185 </li></ul></ul>
  57. 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. 58. 21 Apr 2011 21 Apr 2011 If you are unable to gets the brakes released in this scenario what are your actions?
  59. 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. 60. 21 Apr 2011 21 Apr 2011 If you had to leave the TPWS Temporarily Isolated, what rules apply?
  61. 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
  62. 62. <ul><li>What is the main risk if the TPWS has been temporary isolated during TBW? </li></ul><ul><li>Forgetting to reset the TPWS back to normal at the end of the TBW section </li></ul>
  63. 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. 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. 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?
  66. 66. <ul><li>Checking that the system is fully operable </li></ul><ul><li>Imagine if the Brake Demand light bulb had blown and how it might lead the driver in thinking they have not had a TWPS activation </li></ul>
  67. 67. 21 Apr 2011 21 Apr 2011 You liven up the cab and turn the control key what should happen next?
  68. 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. 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. 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. 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. 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. 73. Positions of TPWS Equipment
  74. 74. <ul><li>Overspeed Loop </li></ul>Example, Position of TPWS Equipment 21 Apr 2011 Arming Loop Trigger Loop <ul><li>Overspeed Loops are positioned before selected signals and all buffer stops on passenger lines to reduce the consequences of a collision from a SPAD or buffer stop collision. </li></ul><ul><li>Train Stop Loops are positioned at selected signals protecting conflict points/junctions. </li></ul>Train Stop Loops
  75. 75. <ul><li>Can a Train Captain/Guard/Conductor act as your competent person during an isolation of the TPWS? </li></ul><ul><li>No, a competent person must have the required skills, rules and knowledge for all of the route over which he/she is required to ride with you. </li></ul><ul><li>What are the roles of the competent person when accompanying the Driver during an isolation of the TPWS equipment? </li></ul><ul><li>On the approach to signals:- </li></ul><ul><ul><li>acknowledge the Driver’s reaction to signal aspects, sequences or indications. </li></ul></ul><ul><ul><li>If necessary remind the Driver of a signal displaying restrictive aspects or indications </li></ul></ul><ul><li>On the approach to speed restrictions: - </li></ul><ul><ul><li>acknowledge the Driver’s reaction to speed restrictions </li></ul></ul><ul><ul><li>If necessary reminding the Driver of a speed restriction ahead </li></ul></ul>21 Apr 2011
  76. 76. <ul><li>What is TPWS + (plus)? </li></ul><ul><li>The original TPWS design is only effective in stopping a train in the overlap up to a train speed of 75mph. </li></ul><ul><li>However, an enhanced system, TPWS+, has provided additional protection at speeds up 100 mph. </li></ul><ul><li>This is achieved by an additional OSS fitted on the approach to the normal OSS at selected signals. </li></ul>21 Apr 2011
  77. 77. TPWS + example 21 Apr 2011
  78. 78. <ul><li>The train passes over the AWS magnet which requires an acknowledgement. The driver takes approximately 2 to 3 seconds to press the AWS reset button. </li></ul><ul><li>Is this a TPWS Brake Demand or a late cancellation of the AWS? </li></ul><ul><li>In this scenario the late acknowledgement of the AWS caused a brake demand. </li></ul><ul><li>Note! Late acknowledgement of the AWS will cause a brake demand and needs to reported to the signaller before any further movement. </li></ul>AWS Magnet
  79. 79. <ul><li>Why have the brakes applied and why did the AWS klaxon not sound? </li></ul><ul><li>In this scenario a TPWS activation/intervention caused the Brake Demand. </li></ul><ul><li>Note! If there is no AWS warning sound associated with the brake demand it is a TPWS activation/intervention. </li></ul>Arming Loop Trigger Loop
  80. 80. <ul><li>Is this a TPWS activation/intervention or late acknowledgement of an AWS warning? </li></ul><ul><li>In this scenario a Driver could believe he has been late to acknowledge an AWS warning when infact he has had a TPWS Brake Demand. This highlights the importance of reporting a Brake Demand caused by a late acknowledgement of the AWS. </li></ul><ul><li>Good route knowledge and situational awareness would help if faced with this scenario </li></ul>AWS Magnet Arming Loop Trigger Loop
  81. 81. <ul><li>What has occurred here? </li></ul><ul><li>In this scenario a TPWS activation/intervention caused the Brake Demand. </li></ul><ul><li>Note! If there is no AWS warning sound associated with the brake demand it is a TPWS activation/intervention. </li></ul>AWS Magnet Arming Loop Trigger Loop
  82. 82. Summary <ul><li>In summary, TPWS has been very effective at reducing SPaD risk but it has some design limitations. Remaining focused and alert when approaching any signal irrespective of the line speed is still a key factor in safe driving techniques. </li></ul><ul><li>This presentation has hopefully given you a better understanding of the TPWS system, why it was introduced, how it works, cab indications and the rules regarding system failure. </li></ul><ul><li>If you have any further ideas or feedback then please feel free to email me at [email_address] </li></ul>
  83. 83. Welcome Any Questions? 21 Apr 2011

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