Signals - 2 Positon Signals Flashcards
What aspects do Home, Dwarf and Disc signals display?
- Stop
- Proceed
What aspects do Distant signals display?
- Caution
- Proceed
What aspects do Siding Dwarf signals display?
- Normal
- Proceed
What are the 2 types of Two Position Signals?
- Light type
- Disc type
What are the 5 different class’ of Two Position Signals?
- Disc
- Dwarf
- Distant
- Home
- Calling On
Is a Disc signal both a Type and Class?
Yes
Where are Two Position Home Signals fixed at and protect?
- Stations
- Sidings
- Signal Boxes
- Level Crossings
- Junctions
What Type are all Two Position Home Signals on the Metro Network?
Light Type
What do Home Signals at the Stop position indicate?
Points - Unknown
Track - May be occupied
Speed - Stop
Next Aspect - Unknown
What do Home Signals at the Proceed position indicate?
Points - Set
Track - Clear
Speed - Track Speed
Next Aspect - Unknown
What is a Distant Signal?
Used as an advanced warning of the ahead Home Signals
What aspects can a Distant Signal display?
- Caution
- Proceed
Distant Signals can be placed to Caution when?
- Immediately when a train passes
- An obstruction on the line
- There is danger on the line
What prevents a distant signal being at a proceed when a Home Signal at that location is at Stop?
Mechanical Interlocking
What must be done when receiving a Calling On Signal?
Drive at Reduced Speed Cautiously because the track may be occupied
Disc Signals are used to control train movements from?
- Running line to Running line
- Running line to siding
- Siding to Siding
- Siding to Running line
What 2 aspects do Disc Signals display?
- Stop
- Proceed
What is the maximum speed in Sidings?
15km
What is the maximum speed using Disc Signals from Running line to Running line?
40km unless specified otherwise
Two Position Dwarf Signals are used to control train movements from?
- Running line to Running line
- Running line to Siding
- Siding to Siding
- Siding to Running line
What are the 2 types of Dwarf Signals?
- Standard Two Position Dwarf Signal
- Siding Dwarf Signal (fitted on the same post as a Home Signal)
What does a Siding Dwarf Signal display for Proceed?
Yellow aspect
What does a Siding Dwarf Signal display for Normal?
Extinguished
When multiple disc signals are fitted to the same post how do you read them?
Top to Bottom then Left to Right
