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Signals, Safeworking & ROUTE knowledge METRO trainee Train driver > 3 POSITION SIGNALS > Flashcards

3 POSITION SIGNALS Flashcards

1
Q

What information does a driver get with 3 position signaling?

A

Points - set or not
Track section ahead, - clear or occupied
Speed - normal/ medium
Next signal - stop or proceed

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2
Q

What does a greenlight inform the driver about the next signal ahead?

A

Next signal will be a another proceed aspect

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3
Q

What does a yellow light inform the driver about the next signal ahead?

A

Next signal will be at stop

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4
Q

What does a medium Speed aspect tell us

A

Medium Speed aspects are used where:

  • there are junctions or diverging running lines
  • Speed of the train is to be reduced to medium due to short track sections
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5
Q

What type of signal are three position signals

A

LIGHT type

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6
Q

What is A light
B light and
C light?

A

A - top
B - bottom
C - on Home Signals

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7
Q

What are the classes of signals three position?

A

Home
automatic
dwarf

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8
Q

What do you three position home Signals protect ?

A

Stations
signal boxes,
sidings
level crossings
junctions

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9
Q

Why is a tramway square protected by Home signals?

A

Because the power in the overhead has to be switched over to accommodate the different voltagei used by different vehicles

(Tram 600 v
Train 1500 v)

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10
Q

What is the purpose of automatic signals?

A

Automatic signals purpose is to expedite the passage of trains by dividing a long section of track into shorter sections

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11
Q

What is the purpose of a home signal and how are they controlled

A

Home protect sections of track, and are regulated by signallers/ area controllers to Regulate trains and protect conflicting movements

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12
Q

Who controls dwarf signals?

A

Signalers

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13
Q

What do dwarf signals control train movements from?

A

Running line to running line
running line to siding
siding to running line
siding to siding

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14
Q

Which signals are absolute

A

Home, dwarf, and disc

(Meaning they require permission from signaller to pass when at stop)

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15
Q

Which signals are permissive

A

Automatic

Drivers can self authorize to pass the signal at stop R1S3

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16
Q

What colors do home and automatic signals display?

A

🔴 red
🟡 yellow
🟢 green

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17
Q

What colors do dwarf signals display?

A

🔴
🟣
🔵

🟢

🟡

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18
Q

Can an automatic signal display a low speed caution?

A

No

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19
Q

What is a marker light?

A

It’s just a smaller light that Only ever displays the color red.

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20
Q

Aspect and meaning?

🟢
🔴

A

CLEAR NORMAL SPEED

  • Points set
  • Track clear
  • Track speed
  • Next signal at proceed
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21
Q

Aspect and meaning?

🟡
🔴

A

NORMAL SPEED WARNING

  • Points set
  • Track clear
  • Normal track speed,
  • Next signal at stop
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22
Q

Aspect and meaning

🟡
🟢

A

REDUCE TO MEDIUM

  • Points set
  • Track clear
  • Normal track speed
    (must reduce to 40 before next signal)
  • Next signal proceed
  • If next signal observed is an improved aspect, requirement to reduce speed, no longer applies
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23
Q

Aspect and meaning

🔴
🟢

A

CLEAR MEDIUM SPEED

  • Points set
  • Clear track
  • 40 for whole section up to next signal
  • ATC: 40 only until whole train has cleared
    the points (home Dep. sig.)
  • Next signal at proceed
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24
Q

Aspect and meaning

🔴
🟡

A

MEDIUM SPEED WARNING

  • Points set
  • Track clear
  • 40 up to the next signal
  • Next signal at stop
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25
Q

Aspect and meaning

🔴
🔴

A

STOP

  • Points not yet set
  • Track may be occupied
  • Reverser to off /neutral (marker lights white)
  • Next signal unknown
26
Q

Aspect / meaning

🔴
🔴
🔅

A

LOW SPEED CAUTION

  • Points set
  • Track may be occupied
  • Max 15
  • Next signal, if any, unknown
27
Q

Can a low speed, caution be used for train movements into a bidirectional portion of track?

28
Q

are low speed caution signals provided for on ATC home departure signals?

A
  • Only to allow movement into the siding or adjacent track
  • they cannot be used to allow train movements into a single line section
29
Q

What signal will you typically get prior to a stop signal?

A

Either a normal speed warning, or a medium speed warning

30
Q

Automatic signal with illuminated 65 or 80 reduced to medium. When must the train be at the allocated speed?

(At the reduce to medium with illuminated 65/80
OR
at the Medium speed with illuminated 65/80)

A

Before the next signal displaying clear medium speed with illuminated 65 or 80 - (not at the reduced to medium signal with 65/80)

31
Q

Aspect and meaning

🔴
🟢
65

A

CLEAR MEDIUM SPEED With illuminated 65 or 80

  • Points set
  • Speed as per signal value (65/80)
  • Track clear
  • Next signal at proceed
  • High speed points
  • Diverging movement
32
Q

Aspect and meaning

🔴
🔴
🅰️

A

ILLUMINATED A ON 3 pos HOME signal

  • Points set for the mainline
  • Signal operating in auto mode
  • Auto signal rules apply (R1S3)
33
Q

When detained at a home signal without the illuminated A displayed, what must you do?

A

Contact the area controller and remain on your train until authorized to pass the signal at stop

Do not pass the signal at stop, unless authorised (treat as a home signal)

34
Q

How do you know if a signal box is switched out and if it is what mode do trains run in?

A

A sign is displayed on the door.

“Signal box closed”

(Run by passage of trains/ in fleeting mode)

35
Q

When, in fleeting mode, (signal box is switched out), how will the signaller have set and secured the points?

A

Points will be set and secured for the normal running lines, so that trains can pass through the unattended location

36
Q

When is the illuminated A ONLY ever displayed?

A
  • When HOME signal it is attached to is at stop
  • when Signal Box is switched out
37
Q

What TYPE of signals are Dwarf signals?

A

Light type

38
Q

What indications do 3 pos.DWARF signals display?

A
  • Stop 🔴🔵🟣
  • Low Speed Caution 🟡
  • Clear Low Speed 🟢
39
Q

dwarf Aspect & meaning
🔴🟣🔵

A

STOP

  • points not set
  • Track may be occupied
  • Reverser OFF/ Neutral
  • next signal unknown
40
Q

Dwarf Aspect & meaning

🟡

A

LOW SPEED CAUTION

  • points set
  • track may be occupied
  • 15 km/h MAX
  • next signal unknown
41
Q

Dwarf aspect & meaning
🟢.

A

CLEAR LOW SPEED

  • points set
  • track clear
  • 15 km/h MAX to next signal
    (ATC - 15 only until train cleared the points)
  • next signal is PROCEED
42
Q

On ATC which signals allow you to increase speed restriction (e.g. 40 or 15km/h) once cleared the points ?

A

CLEAR MEDIUM SPEED
or
CLEAR LOW SPEED

43
Q

What is the purpose of a banner indicator?

A

To indicate the aspect of the signal ahead, where a clear view of that signal cannot be obtained

44
Q

Are banner indicators fixed signals, and can they be considered as the signal in advance?

45
Q

What do we do if a banner indicator is defective?

A

Just report the fault to TC and go past it expecting the next fixed signal to be at Stop

46
Q

What are the following banner indicators?

48
Q
A

NORMAL SPEED WARNING

49
Q
A

CLEAR NORMAL SPEED

50
Q
A

REDUCE TO MEDIUM

51
Q
A

MEDIUM SPEED WARNING

53
Q
A

NORMAL SPEED WARNING

54
Q
A

CLEAR NORMAL SPEED

55
Q

What is the purpose of repeating signals?

A

They are used to give advanced warning of a three position signal when leaving a to position signalled area

56
Q

What aspects can repeating signals display?

A
  • Warning
  • Stop
  • Reduce to Medium
57
Q

Aspect and meaning of repeating signal
🟡
🟡

A

WARNING

  • next signal is at STOP
58
Q

Aspect & meaning of repeating signal
🟢
🟡

A

PROCEED

  • next signal a NORMAL aspect
59
Q

Aspect & Meaning of repeating signal

🟡
🟢

A

REDUCE TO MEDIUM

  • next signal a MEDIUM aspect
60
Q

How do we treat a repeating signal that is defective or is displaying an irregular aspect?

A

At WARNING Which is the safest aspect

Signals, Safeworking & ROUTE knowledge METRO trainee Train driver (48 decks)

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