Three Position Signals Flashcards
Type
Light only
Class (4)
Home
Dwarf
Auto
Repeating
What is the purpose of automatic signals?
To expedite the passage of trains by dividing long sections of track into shorter sections
What are repeating signals used for?
Gives warning of a three position signal when leaving a two position area
How do you know a signal is not in use?
Notified via WON
signals will be bagged
Dwarf and disc will have black cross
3 pos home sigs are fixed at and protect…?
Stations
Sidings
Sig boxes
Level crossings
Junctions
Home and autos can display what colours?
Red
Green
Yellow
Dwarf sigs can display what colours?
Red
Green
Yellow
Blue
Purple
If a home or auto has a marker light as the lower light, what aspects can it display?
Normal or stop
If a home or auto has a marker light as the top light, what aspects can it display?
Medium or stop
Clear normal speed
Points set
Track clear
Track speed
Next sig proceed
Normal speed warning
Points set
Track clear
Track speed
Next sig is stop
Reduce to medium
Points set
Track clear
Track speed but need to be 40 by next sig
Next sig a medium aspect
Clear medium speed
Points set
Track clear
Max 40
Next sig at proceed
In ATC on a clear medium speed or clear low speed when can you speed up? And what sigs will give you these?
When the whole train has cleared the points
Get it on a HD or a dwarf into a single line section
Medium speed warning
Points set
Track clear
Max 40
Next sig at stop
On ATC with a medium speed warning, when can you speed up?
When you get to the next fixed sig
Stop on dwarf and home or auto
Points unknown
Track May be occupied
Must not proceed
Next sig unknown
Low speed caution
Points set
Track may be occupied
Max 15
Prepare to stop
What does an illuminated 65 or 80 mean?
High speed points
What does an illuminated letter A indicate to a driver? And what sig aspect will it be displayed with?
The sig is now in automatic mode
Displayed only when sig is at stop
Clear low speed
Points set
Track clear
Max 15
Next sig proceed
What aspects can a 3 pos dwarf display?
Stop
Low speed caution
Clear low speed
What is the purpose of a banner indicator?
Indicates what the sig ahead is when there is not a clear view
