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Defective Signals

Terms in this set (28)

1. what is the definition of a defective signal? (1)
a signal not operating or displaying correctly, or the light is out when it should be illuminated
2. when may you allow a train to approach a defective stop signal if it has been placed to and kept at danger? (1)
if you are sure the correct aspect/indication is showing
3. when may you allow a train to approach a defective distant signal it it has been placed to and kept at caution? (1)
if you are sure the correct aspect is showing
4. when can you allow a train to approach a defective signal which is showing proceed and will not cause the driver to see an irregular sequence of signals? (4)
if the proceed aspect is correct and
train has been accepted by the box in advance OR
line is clear to the buffer stops on a dead end line OR
line is clear up to and including the overlap of an IBHS
6. when can you allow a train to approach a defective intermediate block home or distant signal? (2)
when the driver has been told about the defective signal and the train has been accepted by the signal box in advance
46. what are your immediate actions when any signal (or signalling equipment) fails? (5)
make the operational railway safe
tell any other signallers affected
tell control
make sure trains pass safely
enter details in TRB
47. if you can confirm that an apparent failure of a signal (or set of points or track circuit) is an indication failure only, when can you allow trains to run normally? (1)
as long as you know the correct aspect is showing
48. if an arm repeater for a semaphore signal indicates that the signal is defective, when do you not actually have to treat the signal as being defective? (1)
if you can see the signal and it responds correctly to the lever
49. what must you do with a distant signal if the arm repeater for that signal indicates that the signal is defective? (1)
keep it at caution until the repeater is repeaired
50. what must you do immediately if a light repeater indicates that a signal light us out? (1)
find out immediately if the signal light is actually out
51. what must you do if a light repeater for a semaphore distant signal indicates that the distant signal light is out and it can be seen by the signaller at the signal box in rear, and under what circumstances do you not need to treat the distant signal as defective? (2)
immediately find out if it is actually out. if you ask the signaller at the box in the rear and they tell you the light us lit it doesn't have to be treated as defective
52. if a light is out on a semaphore signal, when must you treat the signal as being defective? (1)
during darkness or poor visibility
53. if a light repeater applies to a group of semaphore signals what must you do with any light out indication? (1)
treat any light out indication as applying to each signal concerned (each signal in the group)
54. if a signal forms one of a group of signals and there is no aspect or indication being displayed at that signal when there should be one, which drivers do you need to tell about the defective signal (1)
drivers on the line affected and any other lines in the same direction
59. when must you not allow a train to approach a position light signal or shunting signal of which the normal indication is defective? (1)
when a conflicting movement needs to be protected by that signal
60. when may you allow a train to approach a defective position light signal or shunting signal? (1)
when the signal is not needed to protect a conflicting movement. And you have told the driver of the defective signal
61. when must you not allow a train to approach a defective stop board or a limit of shunt indicator? (1)
when a conflicting movement is to be protected by the stop board or limit of shunt indicator
62. when may you allow a train to approach a defective stop board/limit of shunt indicator? (1)
when it is not needed to protect a conflicting movement. And you have told the driver about the defect
63. what must you do if the main power supply fails for colour light signals? (2)
tell control make an entry in the TRB (time)
64. how long may you continue to work normally for, if there is a failure of the main power supply for colour light signals? (1)
as long as the standby batteries are working and visibility is clear
65. when must you treat each signal as being defective when there is a main power supply failure for colour light signals (1)
if the standby power fails (batteries)
66. if there is a mains power failure to a colour light signal during poor visibility what are the 3 occasions a line clear can still be acknowledged? (3)
train out of section or obstruction removed received from advance box.
line is clear to the buffer stops on a dead end line.
line is clear up to and including the overlap of an IBH signal
67. if there is a failure of the main power supply to an IB home or distant signal when can you allow a train to pass the section signal leading up to them? (1)
when train has been accepted from box in advance
5. when can you allow a train to approach a defective signal which is showing proceed and WILL cause the driver to see an incorrect sequence of signals or otherwise will not cause a driver to see correct signal aspects displayed? (5)
the driver has been told of the defect.
the train has been accepted by the next signal box.
line is clear to buffer stops on a dead end line.
line is clear up to and including overlap of IBHS.
defective signal is between home and section signal and line is clear to section signal.
68. what must you do if a driver reports that a signal is difficult to see because of sunlight streetlights or reflections? (4)
tell control.
tell driver of next train the circumstances.
instruct driver of next train to report back the state of the signal.
signal train normally.
69. what may you do if a driver you have instructed to check to see if the signal is difficult to see (sunlight/streetlight/reflections) reports that the signal is not difficult to see? (1)
resume normal working and signal normally
70. what must you do if the driver you have instructed to check to see if the signal is difficult to see (sunlight/streetlight/reflections) reports the signal is difficult to see? (1)
treat it as defective
71. what form is required to be filled in when a signal failure or irregularity is reported, and when is it not needed to be completed? (2)
form 3185.
doesn't need completed if the fault is clearly a right side failure
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