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Class 230 - Cert IV > Signals COPY > Flashcards

Signals COPY Flashcards

1
Q

What are the 6 classes of 2 position signals?

A
  1. Home
  2. Dwarf
  3. Disc
  4. Distant
  5. Siding Dwarf
  6. Calling on
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2
Q

What are the 2 main purposes of signal systems?

A
  1. Communicate to the driver the state of the line ahead
  2. Give the driver authority to proceed
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3
Q

What are the two types of two position signals?

A
  1. Light Type
  2. Disc Type
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4
Q

What signal is both a class and a type?

A

Disc Signal

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5
Q

What do two position Home signals protect (and positioned at)?

A

Stations
Signal Boxes
Sidings
Level Crossings
Junctions

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6
Q

What two aspects can the two position Home system show?

A

Red - Stop
Green - Proceed

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7
Q

When a two position home signal is showing proceed, are the points set and the line clear ahead?

A

Yes the points and line are clear.

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8
Q

What does a proceed aspect on a two position home signal not show?

A

Does not indicate if next signal is at proceed.
Driver should be prepared to stop at next signal and assume it’s at stop.

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9
Q

What 2 aspects do distant signals display?

A
  1. Caution
  2. Proceed
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10
Q

Why would a distant signal be at caution?

A
  1. A train is in the section
  2. An obstruction on the line
  3. A signal in the block is at danger
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11
Q

When coming across a distant signal at caution, can it tell you which signal is at stop?

A

No, it only indicates that a signal in the block is at stop

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12
Q

What does a call on signal mean?

A

A train can enter into an occupied section, past the stop aspect.

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13
Q

How would a driver pass a calling on signal showing proceed?

A

Advance cautiously past the signal and be able to stop short of any obstruction

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14
Q

If the home signal is clear (green) AND bottom light is on, can you proceed?

A

No, it would be treated as an irregular signal aspect. Treat as both signals are at their safest aspect.

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15
Q

What are disc signals used to control? (train movements)

A
  1. Running line to running line
  2. Running line to siding
  3. Siding to siding
  4. Siding to running line
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16
Q

What 2 aspects do disc signals display?

A

Stop and Proceed

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17
Q

What does a disc signal tell us? (PTSN)

A

P - Points are set
T - Track ahead may be occupied
S - Speed is reduced speed cautiously
N - Next signal is unknown so be prepared to stop

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18
Q

When a disc signal is at proceed, what must you be aware of?

A

The line may be occupied or obstructed

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19
Q

What is the max speed at a siding?

A

15km/h

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20
Q

What is the max speed at points? (running line to running line)

A

40km/h

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21
Q

How can a disc signal show an aspect at night?

A

It has a red or green light depending on if it reads stop or proceed

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22
Q

How do you read a set of 4 disc signals on one post?

A

Top to bottom, left to right
1-3
2-4

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23
Q

What does a two position dwarf signal control?

A
  1. Running line to running line
  2. Running line to siding
  3. Siding to siding
  4. Siding to running line
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24
Q

What are the two different types of two position dwarf signals?

A

Standard 2 position dwarf signal
And a siding Dwarf (fitted on same past as home signal)

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25
Q

What aspects can a dwarf signal display?

A

Stop - Red/Blue/Purple
Proceed - Green or Yellow (for a siding dwarf)

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26
Q

How can a siding dwarf and a call on signal be distinguished?

A

Call on is just the light
Siding dwarf has the light AND a siding sign

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27
Q

If a two position dwarf signal is at proceed, is the line clear?

A

No, the track ahead may be occupied

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28
Q

What happens when a track circuit is broken?

A

The signal reverts to it’s fail safe aspect (stop)

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29
Q

What are 3 things that can break a tracks circuit?

A
  1. Damaged track
  2. Obstructed track
  3. Occupied by another train
30
Q

How does an axle counter work?

A

It counts how many axles enter a block and makes sure it matches with how many axles leave the block. It feeds this information to the signals to show the block is occupied or clear.

31
Q

What light colours can be shown by a 3 position signals?

A

Red - stop/reference light
Yellow - warning
Green - clear

32
Q

What information can a 3 position signals provide?

A

Points - set or not set
Track section ahead - clear or occupied
Speed - normal/medium track speed
Next Signal - whether next signal aspect is proceed or stop

33
Q

What is the top light (A light) referring to in a 3 position signal set?

A

The A light refers to normal speed

34
Q

What is the bottom light (B light) referring to in a 3 position signal set?

A

Medium speed aspect

35
Q

What signal class can have a C Light or Low speed aspect?

A

Home signal

36
Q

How can you tell a home signal and an automatic signal apart?

A

Home has two lights vertically
Automatic has the two lights staggered

37
Q

What are the three classes of 3 position signals?

A

Home
Automatic
Dwarf

38
Q

Why is it important to know the difference between the classes of signals?

A

Rules and instructions vary depending on class and location of signal

39
Q

Where are 3 position signals fixed at and protecting?

A

Stations
Signal boxes
Sidings
Level crossings
Junctions

40
Q

Which classes of 3 position signal is usually controlled?

A

Home signals and Dwarf signals

41
Q

If you need to pass a home signal that is uncontrolled, who would you contact for permission?

A

Signaller/Area Controller (Signal Control Panel)

42
Q

What is the primary purpose of automatic signals?

A

Expedite the passage of trains by dividing long sections of track into shorter sections.

43
Q

Can automatic signals at stop be passed?

A

Yes, only if you follow Rule 1, Section 3

44
Q

Which signals are classified as absolute or permissive?

A

Absolute - Home, Dwarf, Disc
Permissive - Automatic

45
Q

How many aspects can a 3 position signal show?

A

6 with A & B lights
7 with A, B & C lights (only on home)

46
Q

What aspect is this signal showing?

A

Clear Normal Speed

47
Q

For a Clear Normal Speed aspect, what does the signal tell us? (PTSN)

A

P - Points are set
T - Track is clear
S - Speed is track speed
N - Next signal will show proceed

48
Q

What aspect is shown on this signal?

A

Normal Speed Warning

49
Q

What does a Normal Speed Warning tell us? (PTSN)

A

P - Points are set
T - Track is clear
S - Speed is track speed, but prepare to stop at next signal
N - Next signal will be at stop

50
Q

This signal is Reduce to Medium, what speed is medium?

A

40km/h

51
Q

What does a reduce to medium signal tell us? (PTSN)

A

P - Points are set
T - Track is clear (till next signal)
S - Track speed but prepare to reduce to medium by next signal
N - Next signal will be at medium aspect

52
Q

What does a Red A light over a Green B light signify? (Name + PTSN)

A

Clear Medium Speed
P - Points are set
T - Track is clear
S - Speed is medium (40km/h)
N - Next signal will be a proceed

53
Q

What is the name of this aspect and what does it tell us? (PTSN)

A

Medium Speed Warning
P - Points are set
T - Track is clear
S - Speed is medium (40km/h), prepare to stop before next signal
N - Next signal is at stop

54
Q

What do 2 red lights on a signal mean?

A

Stop!
Points may not be set, track may be occupied.

55
Q

When stopped at danger aspect, what should you do with your reverser?

A

Set to neutral or off
Marker lights to white

56
Q

What is the name of this aspect and it’s PTSN?

A

Low Speed Caution
P - Points are set
T - Track ahead may be occupied
S - Speed is low speed 15km/h, be ready to stop short of any obstruction
N - Don’t know next signal aspect, assume next one is at safest position

57
Q

What 2 locations can a low speed signal take you to?

A
  1. A siding
  2. Main line track/running line to running line (eg. to a station to couple with another train)
58
Q

When can a Low Speed Caution never be used?

A

For train movements into a bi-directional portion of track

59
Q

What signal aspects come before a stop aspect?

A

Reduce to Medium (sometimes) then Normal Speed Warning or Medium Speed Warning

60
Q

What does an illuminated 65 or 80 mean on a home or automatic signal?

A

High speed points ahead, reduce to 65 or 80 based on what is shown.

61
Q

What does an illuminated red A on a 3 position home signal mean?

A

Home signal has been switched to automatic as is to be treated as an automatic signal (only visible on a signal at stop)

62
Q

If a signaller is operating points and signals, the signal box is referred to as?

A

Switched In

63
Q

If the signaller is off duty, what is the signal box referred to as?

A

Switched out

64
Q

When the signal box is switched out and running by the passage of trains, what is the mode called?

A

Fleeting Mode

65
Q

What 3 aspects does a three position dwarf show?

A

Stop
Low speed caution
Clear low speed

66
Q

What is the primary purpose of Banner Indicators?

A

They indicate the aspect of the signal ahead when a clear view of the signal cannot be obtained

67
Q

Banner Indicators are not….?

A

They are not:
Fixed signals
Considered to be signals in advance

68
Q

What signal is being repeated on the Banner Indicator when it shows 2 horizontal lines?

A

Stop

69
Q

What aspect is shown on the Banner Indicator?

A

Normal Speed Warning

70
Q

What signal is the Banner Indicator showing?

A

Reduce to medium

71
Q

What aspect is the Banner Indicator showing?

A

Stop

72
Q

Who do you report a faulty Banner Indicator to?

A

Train Control @ Metrol

Class 230 - Cert IV (17 decks)

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