Signals Flashcards
What are the two types of signals?
- 2 position
- 3 position
What are the 2 types of 2 position signals?
- light
- disc
What are the 5 classes of 2 position signals?
- home
- disc
- dwarf
- distant
- calling on
What aspects can home, normal dwarf and disc signals display? (2 position)
- stop
- proceed
What 2 aspects can a distant signal show? (2 position)
- caution
- proceed
What 2 aspects do siding dwarf and calling on signals display? (2 position)
- normal (extiniguished)
- proceed (illuminated)
What 5 things do 2 position home signals protect?
- sidings
- signal boxes
- stations
- level crossings
- junctions
Can a distant signal display stop?
No. It is just an advanced warning of the home signal ahead
Is a hand signaller required for a defective distant signal?
- only for proceed aspect
- hand signaller will:
• place 2 ATWs on one rail
• display a stop/red hand signal to stop trains until permission can be given for them to proceed
What is a disc signal described as?
- a red circular target that can be turned to the side
How do you read a 2 position signal when there are multiple signals fitted together?
Top to bottom, left to right
What are signals used for?
- control the movement of rail traffic
- keep trains separated at a safe distance
Where can disc signals and standard dwarf signals take you? (2 position)
- running line to running line
- running line to siding
- siding to siding
- siding to running line
What 3 things can a 3 position signal tell you about the line ahead?
If it is:
- damaged
- occupied
- obstructed
How are 3 position signals operated?
- by the signaller
- track circuitry
- axle counters
What 4 things do the aspects on a signal tell you?
P - points are set/not set
T - track ahead is clear/occupied
S - normal or medium track speed
N - next signal is displaying proceed or stop
What is the 1 type of a 3 position signal?
Light
What are the 4 classes of 3 position signals?
- home
- dwarf
- automatic
- repeating
How do you label the lights on a 3 position signal?
A = top light
B = bottom light
C = low speed caution, found only on home signals
What do 3 position home signals protect?
- station
- siding
- signal boxes
- level crossings
- junctions
What do automatic signals do?
Expedite the passage of trains by dividing a long section of track into shorter sections
How do you identify an automatic signal?
Lights are staggered
How do you pass an automatic signal at stop?
Under your own authority as per Rule 1 Section 3
What movements do 3 position dwarf signals control?
- running line to running line
- running line to siding
- siding to siding
- siding to running line
What is the maximum speed you can do past a signal displaying a low speed caution?
- 15 km/h
- proceed cautiously prepared to stop short of any obstruction as line ahead may be occupied
What is the maximum speed you can do at a medium speed aspect?
- max 40 km/h
- can do 65 km/h or 80 km/h if displayed on the speed indicator on the same signal
What does an illuminated letter ‘A’ mean on a 3 position home signal?
- signal is in automatic mode
- ‘A’ light will only illuminate if signal is at stop
What 3 aspects can a 3 position dwarf signal display?
- stop
- low speed caution
- clear low speed
What is the maximum speed you can do when passing a 3 position dwarf signal displaying a low speed caution or a clear low speed?
- 15 km/h
What are banner indicators used for?
- repeat the aspect of the next signal in advance
- usually used when next signal is has poor sighting distance
What are repeating signals used for?
Takes you from a 2 position system to a 3 position system
What 3 aspects can a repeating signal display?
- warning
- proceed
- reduce to medium
Can a repeating signal display a stop indication?
No - it has no red light
How do you treat a repeating signal if it is displaying and irregular aspect?
- at it’s safest position = warning
- treat the following signal as if it’s at stop until ascertained otherwise
