Signal Equipment Failure

Question 1

Allow a train to approach a defective signal if (2)

Answer 1

1. You are sure the signal is showing danger.
2. You are sure the signal is showing the correct aspect and will not cause the driver to see an incorrect sequence.

Question 2

What must you tell the driver about the defect? (3) NSB

Answer 2

1. The line is clear up to the overlap of the next stop signal that is displaying a correct aspect, beyond a defective signal.
2. The line is clear up to the overlap of the second stop signal beyond a defective distant signal.
3. The line is clear to the buffer stops on a dead end line.

Question 3

What do you do when a controlled signal has been replaced to danger for no obvious reason? (4)

Answer 3

1. Advise control and arrange signalling technician.
2. Only allow the train to approach the signal if it is at danger.
3. Clear the signal only when the approaching train is on or nearly at a stand.
4. Continue this method of working until the signalling technician tells you that normal working can be resumed.

Question 4

Before you authorise a train to pass a defective signal at danger you must (4)

Answer 4

1. Make sure the last train has passed clear of the of the next stop signal.
2. No conflicting movements have been authorised.
3. The driver is advised that all track circuits are showing clear.
4. Reach a clear understanding with any other signaller involved.

Question 5

Defective signal equipment on a single line, you must (3)

Answer 5

1. Operate any acceptance switch as normal.
2. If controlled by one box keep a record of when trains were authorised to pass the signal at danger.
3. Signal trains according to regulation 3.5 if single line is controlled from two signal boxes.

Question 6

What to do if you have a failure of train describers (2)

Answer 6

1. Keep a record of trains in your area of control.
2. Inform other signallers of the identity of trains entering their area. If the signaller is in another box, you must send a train description by Bell or telephone.

Question 7

If a train or vehicle fails to operate a track circuit, you must immediately: (3)

Answer 7

1. place or keep signals at danger to protect the train or vehicle
2. place or keep signals at danger to protect the track circuit concerned
3. tell Operations Control

Question 8

Until the signalling technician tells you that the track circuit that failed to operate can be relied upon to indicate the presence of trains correctly, before allowing a train to pass over the track circuit concerned, you must: (3)

Answer 8

1. make sure the previous train has passed beyond the overlap of the next stop signal.
2. keep points in the correct position for the train movement using individual point controls.
3. place at danger any other signal which would conflict with the movement.

Question 9

You do not need to carry out regulations 15.1 and 15.2 when a train or vehicle fails to operate a track circuit, but has operated track circuits elsewhere: (2)

Answer 9

1. when the line has not been used for a considerable time, or
2. when the train was the first to pass over a portion of line that was affected by a possession or line blockage.