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Three Position Signals Flashcards

(54 cards)

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1
Q

What does the location of the green or yellow light, top or bottom light inform the driver about? (4)

A
  1. Points - set for the movement or not yet set for the movement
  2. Track section ahead - is it clear or occupied
  3. Speed - is it normal track speed or medium speed
  4. Next signal - is it displaying a proceed aspect or STOP
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2
Q

What type of signal are all 3 position signals on the metro network?

A

Light Type

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3
Q

What type of classes are there for 3 position signals? (3)

A
  • home (in line vertically)
  • automatic (staggered)
  • dwarf (one light only displays)
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4
Q

What type of signal is this?

A

Home signal

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5
Q

Are home signals controlled by a signaller?

A

Yes

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6
Q

What do 3 position home signals protect? (5)

A
  • stations
  • signal boxes
  • sidings
  • level crossings
  • junctions
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7
Q

What is the primary purpose of automatic signals?

A

To expedite the passage of trains by dividing a long section of track into shorter sections

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8
Q

Who controls dwarf signals?

A

Signallers

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9
Q

Can a dwarf signal display more than one colour at a time?

A

No

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10
Q

Where do dwarf signals control train movements from? (4)

A
  • running line to running line
  • running line to siding
  • siding to running line
  • siding to siding
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11
Q

What are fixed signals classified as? (2)

A
  • absolute
  • permissive
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12
Q

What type of signals are absolute? (3)

A
  • home
  • dwarf
  • disc
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13
Q

What type of signals are permissive? (1)

A
  • automatic
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14
Q

Who controls home, dwarf and disc signals?

A

Signaller

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15
Q

Who controls a permissive signal?

A

No one they are automatic

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16
Q

What type of signal is this?

A

Automatic signal

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17
Q

What type of signal is this?

A

Dwarf

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18
Q

What colours are home and automatic signals? (3)

A
  1. Red
  2. Yellow
  3. Green
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19
Q

What colours can dwarf signals be? (5)

A
  1. Purple
  2. Blue
  3. Yellow
  4. Red
  5. Green
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20
Q

What colour can a marker display?

A

Red

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21
Q

What is this aspect called?

A

Clear Normal Speed

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22
Q

What does clear normal speed aspect mean for a home signal? (4)

Study These Flashcards
A
  1. Points if any are set
  2. Track is clear
  3. Proceed at track speed
  4. Next signal will be at PROCEED aspect
23
Q

What does Normal Speed Warning aspect mean for a home signal? (4)

Study These Flashcards
A
  1. Points if any are set
  2. Track is clear
  3. Proceed at track speed but speed must be reduced to enable you to stop at the next fixed signal
  4. Next fixed signal is at STOP
24
Q

What is this aspect called?

Study These Flashcards
A

Normal Speed Warning

25
What is the name of this aspect?
Reduce to Medium Speed
26
What does Reduce to Medium Speed mean? (4)
1. Points if any are set 2. Track is clear 3. Proceed at track speed however must reduce to 40km/h by next fixed signal 4. Next fixed signal will show a proceed aspect
27
What is the name of this aspect?
Clear Medium Speed
28
What does Clear Medium Speed aspect mean? (4)
1. Points if any are set 2. Track is clear 3. Proceed at medium speed (max 40km/h) until next fixed signals 4. Next signal is at proceed
29
What is the name of this aspect?
Medium Speed Warning
30
What does Medium Speed Warning mean?
1. Points if any are set 2. Track is clear 3. Proceed at MAX 40km/h until next fixed signal 4. Next signal is at STOP
31
What type of signals could you encounter when a fixed signal is showing proceed aspect? (3)
1. Clear Normal Speed 2. Normal Speed Warning 3. Reduce to Medium
32
What does this signal aspect mean?
Stop
33
What does STOP aspect mean for a home signal? (4)
1. Points if any unknown 2. Track may be occupied 3. Must NOT proceed 4. Next fixed signal is unknown
34
What signal is this?
Low Speed Caution
35
What does Low Speed Warning aspect mean for a home signal? (4)
1. The points if any are set 2. Track may be occupied 3. Track speed is MAX 15km/h 4. Prepare to stop if next signal is at STOP
36
What will display beforena STOP aspect? (2)
1. Normal speed warning (yellow over red) or 2. Medium Speed Warning (red over yellow)
37
What do illuminated 65 or 80 signs located on 3 position signals mean?
There are high speed points ahead (instead of normal 40km/h points) that you can go through at higher speeds
38
What does a Clear Medium Speed with an Illuminated 65 or 80 sign mean? (4)
1. Points if any are clear 2. The track is clear 3. Proceed at the speed that is illuminated until the next fixed signal 4. Next fixed signal at PROCEED
39
What does an Illuminated letter A mean on a 3 Position Home signal?
1. Points attached for the home signal are set for the main line 2. Signal is operating on automatic mode 3. Rules apply to passing it at Stop are same as auto signal
40
What does it mean by Fleeting mode?
Metro controlled area run by the passage of trains when the signal box is switched out.
41
In fleeting mode what rule can be followed?
Section 3 Rule 1
42
What does it mean by signal box switched in?
Signaller is on duty and signal box is considered to be attended. When the signaller is operating the points and signals
43
What does the term signal box switched out mean?
When the signaller goes off duty and the signal box is considering to be unattended.
44
45
What train movements are controlled by dwarf signals? (4)
1. Running line to running line 2. Running line to siding 3. Siding to siding 4. Siding to running line
46
What 3 positions can dwarf signals indicate?
1. Stop 2. Low speed caution 3. Clear low speed
47
What 3 position dwarf aspect is this signal showing?
Stop
48
What does STOP aspect mean for a 3 position dwarf signall? (4)
1. Points if any are unknown 2. The track may be occupied 3. Must NOT proceed 4. Next signal is unknown
49
What colour does a stop dwarf signal aspect use for a 3 position signal? (3)
1. Red 2. Blue 3. Purple
50
What is this signal?
Dwarf low speed caution
51
What does Low Speed Caution aspect mean for a 3 position dwarf signal? (4)
1. The points if any are set 2. The track ahead may be occupied 3. Max track speed or 15km/h 4. Next aspect is unknown
52
What is this aspect?
Dwarf 3 position aspect Clear Low Speed
53
What does Clear Low Speed aspect mean for a 3 position dwarf signal? (4)
1. Points if any are set 2. Track ahead is clear 3. Max speed 15km/h up to the next fixed signal. 4. Next fixed signal will display proceed aspect
54
What is the primary purpose of a banner indicator?
Indicates the aspect of the signal ahead where a clear view of that signal cannot be obtained

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