Signalling ass 2 Flashcards
What are the driver’s responsibilities in respect of signals?
You must obey any signal that applies to your train movement.
What do the terms ON and OFF mean in relation to a signal?
On - signal at danger
(If distant signal - prepare to stop as next signal showing a red)
Off - proceed
What is the length of the overlap in an absolute block area?
400 meters
Draw a diagram of an absolute block system where there is a short braking distance between the section signal of Box A and the home signal of Box B.
To be updated
What is a track circuit and what are they used for in an absolute block signalling area?
Track circuit- a low voltage electrical current that is passed along the tracks. When a train passes over this circuit it identifies its location by making a complete circuit.
Draw both types of semaphore shunting discs in the ON position.
Don’t forget the disc with a white background and red stripe - the lamp can display red or green
What instructions apply with a yellow/white and yellow/black shunting signal?
On position - you must STOP unless, preforming a movement into the shunt-neck or a siding.
You can only proceed onto the main line if this disc in the proceed position ie 45* angle showing a green light.
What signal controls the entrance to the absolute block section?
The section signal.
What is the purpose of an overlap?
The overlap is a safety margin beyond the signal, preventing any conflicting movement, possible collision.
Draw the stepped method of route indication used within a semaphore signalling area.
Draw the stacked method of route indication used within a semaphore signalling area.
What is the purpose of a banner repeater and describe each indication you could receive.
3 state banner
Green background 45 * angle = proceed
2 state
White background 45* angle = off proceed but depending on signal, could be displaying yellow, or green
White background not at 45* = signal is displaying a STOP / Red
Draw a stop board and explain its purpose.
Can be found on sidings, depots and main lines.
Draw the three different limit of shunt indicators.
If your train makes an unsolicited brake demand application on the approach to a signal, when you have ruled out a TPWS brake intervention, what must you do before restarting?
Contact the signaller and outline details
Contact the guard (if one)
Check you have not divided
Check passcom has not been activated
Obtain authority from signaller to move
Recheck the signal before moving
Draw a SPAD indicator, explain its purpose and your actions if it is lit been activated.
Purpose:
To stop all trains following an unauthorised movement to prevent a conflicting movement.
