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DEGRADED WORKING pt1 > AWS > Flashcards

AWS Flashcards

1
Q

What is AWS?

A

Automatic warning system.

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2
Q

When was AWS implemented?

A

1950’s.

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3
Q

What is the purpose of AWS?

A

It provides the driver with an audible and visual indication of whether the distant signal is clear or at caution.

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4
Q

What would happen if the driver failed to respond to a warning indication?

A

An emergency brake application will be initiated.

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5
Q

What does the AWS consist of?

A

Train and track equipment.

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6
Q

How far is the AWS magnet normally placed on the approach to a signal?

A

180 meters (200 yards)

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7
Q

How does the AWS system work?

A

The train detects sequences of magnetic fields passing between the track and the train equipment via a receiver under the train.

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8
Q

Where may AWS track equipment not be provided?

A

At through stations where the permitted speed is 30 mph or less and the layout is complex.

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9
Q

When this occurs, what is it called?

A

An AWS gap.

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10
Q

At what type of stop signals is AWS not provided?

A

Semaphore signals.

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11
Q

What semaphore signal is provided with AWS?

A

The distant signal when it is mounted on the same post as a semaphore stop signal.

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12
Q

Where can you find information on where a line is not fitted with AWS?

A

The sectional appendix.

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13
Q

Aside from signals, what do AWS magnets alert the driver to?

A

Level crossing warning boards or indicators
Temporary speed restriction warning boards
Emergency speed restriction warning boards and indicators

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14
Q

Where is AWS mounted?

A

In the four foot.

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15
Q

What type of magnet will the train first encounter?

A

A permanent magnet.

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16
Q

What type of warning does the permanent magnet give?

A

A warning indication to the driver.

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17
Q

What magnet comes after the permanent magnet?

A

An energised electromagnet.

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18
Q

What indication does the electromagnet give the driver?

A

A ‘clear’ indication when approaching a signal or a semaphore distant
signal showing ‘clear’.

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19
Q

What does the AWS receiver detect?

A

Detects the sequences and polarities of magnetic fields from the AWS
track magnets.

20
Q

What does the audible indicator give?

A

Gives a warning or clear indication.

21
Q

What are the types of AWS warning indicators?

A

A clear indication (bell)

A warning indication (horn)

22
Q

What does the black indicator (in the cab) mean?

A

It advises the driver that the associated signal is showing a green aspect or ‘all clear’.

23
Q

What else does it advise the driver?

A

It advises the driver that the audible warning has not been acknowledged.

24
Q

What does the yellow and black indicator (in the cab) advise?

A

It advises the driver that a warning indication has been acknowledged.

25
Q

What will be applied if the driver fails to acknowledge the AWS warning
indicator?

A

The brakes will be applied (emergency).

26
Q

What is the purpose of the AWS/TPWS acknowledgement button?

A

It is used to acknowledge an AWS warning.

27
Q

How much time does a driver have to acknowledge the AWS warning?

A

Two to three seconds (2.7).

28
Q

If there is a fault with the AWS, how many fault indicators does the
AWS have?

A

Three indications.

29
Q

What colour are the AWS isolation/fault indicators?

A

Yellow.

30
Q

If the AWS indicator light is off, what state is this?

A

Normal.

31
Q

If the AWS light is flashing, what state is this?

A

A fault has been detected in the train AWS equipment.

32
Q

If the AWS light is on (steady), what state is this?

A

The train AWS equipment has been isolated.

33
Q

When will the driver receive a warning indication?

A

On the approach to a colour light signal displaying a single or double yellow or a red aspect.

Semaphore distant signal displaying a caution indication.

Warning indicator provided for some permissible speed reductions.

Warning board provided for ABCL, AOCL or OC level crossings.

Warning board or emergency indicator for a TSR or ESR.

Cancelling indicator for an AWS warning which does not apply to the train.

34
Q

AWS is capable of distinguishing between a red, double yellow or single aspect. True or false?

A

False.

35
Q

The driver will receive a clear indication in the driving cab when approaching:

A

A colour light signal showing a green aspect.

A semaphore distant signal displaying a clear indication.

36
Q

The driver does not have to acknowledge a clear indication. True or false?

A

True.

37
Q

In some AWS fitted areas, AWS equipment is not provided throughout. How are these areas identified?

A

They are identified with signs.

38
Q

What are the signs for the start of the AWS gap?

A

A white circle with AWS written in black letters and a red cross through it.

39
Q

What are the signs for the end of the AWS gap?

A

A white square with the letters AWS written inside of it.

40
Q

On single and bi-directional lines, what normally happens to the AWS magnet?

A

It is normally suppressed for movements to which it does not apply and the AWS will not operate.

41
Q

Where the AWS magnet is not suppressed, what indicator is provided?

A

A cancelling indicator.

42
Q

What does the cancelling indicator advise the driver?

A

It advises that the indicator does not apply to trains travelling in that direction.

43
Q

Where the AWS magnet is permanently installed, what does this sign look like?

A

Blue square with a white cross inside of it.

44
Q

Where the AWS magnet is provided in connection with a temporary or emergency speed restriction?

A

A yellow square with a black cross inside of it.

45
Q

At what distance is the cancelling indicator normally positioned?

A

180 meters (200 yards)) after passing over the AWS magnet.

DEGRADED WORKING pt1 (26 decks)

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