Three Position Signals Flashcards
What Type can Three Position Signals be?
Only Light
What Class can Three Position Signals be?
Home
Automatic
Dwarf
Repeating (2 pos. area to 3 pos. area)
How are the Lights on a 3 Position Signal labelled?
Where are Three Position Home Signals fixed and what do they protect?
where equipment needs to be operated by someone and sections of track need to be protected:
Stations
Signal Boxes
Sidings
Level Crossings
Junctions
What is the purpose of Automatic Signals?
They expedite the passage of trains by dividing a long section of track into shorter sections.
How are Automatic Signals controlled?
Track circuits and passage of trains
Where do Dwarf Signals control train movements from?
Running Line to Running Line
Running Line to Siding
Siding to Siding
Siding to Running Line
What colours can Home and Automatic Signals be?
Red
Yellow
Green
What colours can Dwarf Signals be?
Purple, Blue, Red
Yellow
Green
What aspects can 3 Pos Dwarf signals show?
Stop
Low Speed Caution
Clear Low Speed
What is this signal and what does it mean?
What is this signal and what does it mean?
Proceed - At Track Speed (but reduce so that you can stop at next fixed signal)
What is this signal and what does it mean?
What is this signal and what does it mean?
What is this signal and what does it mean?
What is this signal and what does it mean?
What is this signal and what does it mean?
Low Speed Caution is not affected by the track circuit meaning trains can enter occupied sections.
On an ATC Home Departure, what aspects can you increase to track speed after clearing the points?
Home and Dwarf?
Home = Clear Medium Speed
Dwarf = Clear Low Speed
What do Clear Medium Speeds indicate on a Home Signal to a Driver?
Diverging through points
What are High Speed Points?
Automatic or Home Signals with illuminated 65 or 80 figures indicating to driver that instead of doing 40km you can do 65 or 80.
Would you get an illuminated 65/80 on a Medium Speed Warning?
No. Next signal will be at stop
What does an Illuminated letter A mean?
The points for the Home signal that it’s attached to are set for the mainline
The signal is operating in automatic mode
The rules that apply to it are now the same as an automatic signal
On a Signal with an illuminated A, What does the term switched in or ‘not in fleeting mode’ mean?
The Signaller is on duty
the Signal Box is attended.
On a Signal with an illuminated A, what does the term Switched Out or in ‘fleeting mode’ mean?
The signal is acting as Automatic
The Signal Box is unattended
A ‘Signal Box Closed’ Sign will be displayed in a visible location to indicate the Signaller is off duty.
What is this signal and what does it mean?
What is this signal and what does it mean?
What is this signal and what does it mean?
What is a Banner Indicator
They repeat the aspect of the signal in advance (because new infrastructure has blocked view)
They are not Fixed Signals
They are not to be considered as the signal in advance
What happens when Banner Indicators Fail?
Driver must presume the next fixed signal is displaying Stop
Driver must reduce the speed of the train so that it can stop should the signal be displaying a Stop Aspect
What are Repeating Signals?
They give advanced warning of a Three Position Signal when leaving a Two Position Signalled area.
What is this signal and what does it mean?
Repeating Signal at Warning
The next 3 Position Signal is displaying a Stop Aspect
What is this signal and what does it mean?
Repeating Signal at Proceed
The next 3 Position Signal is displaying a Normal Speed Aspect
