Trainee Driver > Signalling > Flashcards

Signalling Flashcards

(52 cards)

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1
Q

What does a Green signal indicate?

A

Clear. The train may proceed subject to any speed restrictions

This applies to the section of line or to the train itself.

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2
Q

What does a Double yellow signal indicate?

A

Preliminary caution. The next signal is displaying a single yellow aspect

This alerts the driver to prepare for the next signal.

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3
Q

What does a Flashing double yellow signal indicate?

A

The next signal is showing flashing yellow

This is a warning for the driver regarding the upcoming signal.

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4
Q

What does a Single yellow signal indicate?

A

Caution. The driver must prepare to stop the train at the next signal

This is a warning to slow down.

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5
Q

What does a Flashing single or double yellow signal warn of?

A

A diverging route is set

The next signal will be a steady single yellow with a junction indicator.

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6
Q

What does a Red signal indicate?

A

Danger/Stop

This signal must not be passed unless authorized.

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7
Q

What are the two main types of semaphore signals?

A
  • Stop
  • Distant

The stop signal advises whether the line ahead is clear or not.

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8
Q

What does a semaphore stop signal consist of?

A

A red, square-ended arm with a vertical white stripe at the end

It shows a red light when ‘on’ and a green light when ‘off’.

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9
Q

What is the purpose of a distant signal?

A

To advise the driver of the state of the following stop signal(s)

It may be passed in the ‘on’ position but requires the driver to slow down.

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10
Q

What colours do two-aspect systems use?

A

Stop
* Red
* Green

Distant
*Green
*Yellow
## Footnote

These systems are simpler and used in less busy routes.

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11
Q

What colours do three-aspect systems include?

A
  • Red
  • Yellow
  • Green

This allows for more signaling options.

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12
Q

What does a flashing single or double yellow aspect indicate?

A

A train is to take a diverging route ahead

This is used in 4-aspect signaling.

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13
Q

If a signal malfunctions and shows no aspect, the driver must treat it as _______.

A

red

The driver must contact the signaller.

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14
Q

What do position light signals allow a train to do?

A

Move into a section under caution

The driver must drive at a speed that enables them to stop short of any obstruction.

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15
Q

What do associated position light signals (APLS) indicate?

A

They are illuminated only when there is permissive working

They display two white lights at an angle of 45° when the main signal is red.

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16
Q

What do ground position light signals (GPLS) display?

A
  • Two red lights: Stop
  • Two white lights at 45°: Proceed

They can also display combinations of white and red lights.

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17
Q

What do shunt ahead signals typically display?

A
  • Two yellow lights
  • One white and one yellow light

They are usually found at the exits of marshaling yards and sidings.

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18
Q

What is a SPAD indicator?

A

A separate indicator positioned after a main signal to warn of potential collisions

It displays a steady red light after a SPAD occurs.

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19
Q

What do banner repeater signals provide?

A

Advance information of the signal aspect

They are used when sighting is restricted.

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20
Q

What does a banner on signal indicate?

A

The signal to which it applies (the next signal) is at danger (red).

This alerts the driver to the status of the upcoming signal.

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21
Q

What is this signal and what does it indicate?

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A

It is a banner on repeater signal. The following signal is a red danger/stop signal.

22
Q

What is this signal and what does it indicate?

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A

It is a banner off repeater signal. The following signal is displaying a proceed aspect, but we treat it as proceed at caution.

23
Q

What is this signal and what does it indicate?

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A

It is a banner off repeater signal. The following signal is displaying a green proceed aspect.

24
Q

What is the purpose of co-acting signals?

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A

To provide a clearer view of the main signal for the train driver

They show the same aspect as the main signal.

25
What is this signal and what does it indicate?
It is a **SPAD indicator**, normally found about 50m behind certain signals. If you see an activated SPAD indicator you must stop immediately and contact the signaller, regardless of which line you're on.
26
What is this signal and what does it indicate?
This shows the speed limit of 40mph applies to the diverging left route.
27
What is this signal and what does it indicate?
It is an alphanumeric route indicator. Normally, but not always, the number will represent the line that you are to join, or the letter will correlate with the route.
28
What is this signal and what does it indicate?
This is showing a proceed aspect, and an illuminated junction indicator, taking the first left route.
29
What is this signal and what does it indicate?
This is showing a proceed aspect, and an illuminated junction indicator, taking the right route.
30
What is this signal and what does it indicate?
This is a **limit of shunt** indicator. This identifies the furthest a train can move before it interferes with the track circuit system of the next signal section.
31
What does permissive working allow?
It allows more than one train at a time to be on the same line in a signal section/line block.
32
What does POSA mean?
Proceed on sight authority. A signal that allows a train driver to proceed past a signal that has failed. The driver must move slowly, prepared to stop at any moment short of an obstruction. It is a position light that flashes white at 45 degrees.
33
What is the principle of absolute block?
One train, in One block section, on One line at One time.
34
What is the principle of track circuit block?
One train in One signal on One line at One time
35
What is a signal section?
It is the distance between 2 stop signals
36
What colours are proceed aspects?
Green (proceed, clear) Yellow (proceed, caution)
37
What does a proceed aspect mean?
The section ahead is clear and the train is allowed to proceed past the signal
38
What does a double yellow signal mean?
It’s a preliminary caution, you can proceed but be prepared to find the next signal displaying a single yellow
39
What does a single yellow mean?
Caution. Proceed, but be prepared that the next signal WILL be red.
40
How long do you have to press the yellow AWS button?
2.2 seconds
41
In a two aspect colour signalling system, how would you identify a distant signal?
They will have the letter ‘R’, ‘RR’, or a white triangle.
42
How do axle counters work?
They count the number of axles entering a signal section, and provide a signal line block until the same number of axles are counted out of the signal section.
43
What is the ‘overlap’?
At the point where one signal section ends and another begins, there is an overlap following the signals, to allow for clearance of the signal.
44
In an absolute block, what is the service braking limit?
It is a safety margin that allows for the fastest train on that line to brake safely and come to a complete stop before obstruction.
45
What are the three types of semaphore junction indicators?
Stepping Stacking Route indicators.
46
What does this sign mean?
This is a ground signal (shunt disc). It means stop.
47
What does this sign mean?
It is a ground signal, a shunt disc, showing proceed at caution.
48
What does this signal mean?
This is a ground signal, a shunt disc usually found in depots or sidings. It means stop, expect movements towards the shunt neck or siding. You can pass it, to move into the shunt neck. If the stripe was diagonal, it means that the route onto the mainline has been set, and you can proceed at caution.
49
What is this sign and what does it mean?
It is a **Possession Limit Board** It is a stop sign. It is used by network rail when undertaking maintenance, and marks the boundary of possession.
50
What does this sign mean?
OFF RA The off is shown when the driver is shown a proceed signal (green) RA means Right Away - it's safe to proceed.
51
What does this sign mean?
OFF CD The off is shown when the driver is shown a proceed signal (green) The CD is an abbreviation for close doors.
52
What is this sign?
It's a **stop-board.*** You MUST stop and can only pass it once the accompanying instructions are completed, or an authorised person gives you permission.
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