LX

Question 1

When must you treat the AHBC equipment has failed? (4)

Answer 1

1. If an alarm sounds.
2. Road traffic signals are not operating correctly.
3. Barriers fully raised or road traffic signals are operating a no train is approaching.
4. A failed train is occupying a controlling track circuit.

Question 2

If there is an indication that the power to the AHBC has failed, how long can you allow trains to run normally over the crossing?

Answer 2

The first six hours

Question 3

What circumstances would you need to arrange a local control, which are classed as immediately affecting the operation of an AHBC? (3)

Answer 3

1. Failure of the equipment affects the normal operation of the crossing.
2. Train fails within the crossing controls.
3. Normal flow of road traffic over crossing is affected by emergency roadworks or a road traffic incident.

Question 4

After local control has been taken and before the protecting signal is cleared, what was the driver of each train that is to pass over the AHBC be told? (2)

Answer 4

1. Approach at caution.
2. Not Passover it until authorised by a green hand signal shown at the crossing.