Defective Signals Flashcards
If there is a failure of the main power supply to a colour light distant signal during poor visibility, what are the three situations when the line clear can be acknowledged, which one of the situations must apply? (3)
- Train out of section or obstruction removed has been received.
- The line is clear to the buffer stops on a dead end line.
- The line is clear up to and including the overlap of an intermediate block home signal.
If there is a failure of the main power supply to an intermediate block home or intermediate block distant signal, when can you allow a train to pass a section signal leading up to them? (2)
- Driver told about the defective signal.
- When the train has been accepted by the next signal box.
What must you do if a driver reports that a signal is difficult to see because of sunlight street lights or reflections? (4)
- Tell operations control.
- Tell the next train what has happened.
- Instruct the driver to report the state of the signal.
- Signal the train normally.
When must you not allow a train to approach a defective stock board or a limit of shunt indicator? (1)
If conflicting movement is to be protected by the stock board or a limits of shunt indicator
What must you do if the main power supply fails for colour light signals? (2)
- Tell operations control.
- Make an entry in the train register.
How long may you continue to work normally for if there is a failure of the main power supply for colour light signals? (2)
- The standby batteries are working.
- The visibility is clear.
If a light repeater applies to a group of semaphore signals, what must you do with any light out indication?
Treat it as applying to each signal concerned
If a signal forms one of a group and no aspect or indication displayed when there should be one, which drivers do you need to tell about it? (2)
- Drivers on the line affected.
- Drivers on any other line in the same direction.
