Three Positions - Two Positions Signals Flashcards
Three Positions Signals - Name the type?
Light
Three Positions Signals - Name the Class?
Home, Automatic and Dwarf
Three Positions Signals - How Many colour combinations?
Home: 7 (includes the Low Speed Caution)
Automatic: 6
Dwarf: 3
How many lights can you show at a time on Dwarf Signal?
Only 1
What are the colours displayed on Dwarf Signals?
Red, Yellow, Green and Purple
What are the colours displayed on Home and Automatic Signals?
Red, Yellow and Green
How many aspects does a Dwarf three position Signal have?
3
What are the aspects for Dwarf Signals and their respective colour(s)?
3 Position
Red or Purple - STOP aspect
Green - CLEAR LOW SPEED
Yellow - LOW SPEED CAUTION
2 Position Red or purple - STOP aspect Green - Proceed Siding dwarf illuminated - Proceed Siding dwarf extinguished - Normal
What are the 4 questions you need to ask to describe the aspect of a signal?
PTSN
P = Points - Are they set or not?
T = Track Ahead - Is the track clear or occupied?
S = Speed - What is the track speed?
N - Next Signal? What does it tell me about the next signal (either stop or proceed aspect)?
What are the advantages of having Track circuits and Automatic signals in a block section of the track?
- Allows more trains
- Allows more track sections to be included within a block section protected by Home Signals
How are Home Signals controlled?
By Signallers
How are Automatic Signals controlled?
By the passage of trains.
Describe a Clear Normal Speed signal and explain what it means
Green light above Red light.
- Points, if any, are set
- Track ahead is clear up to the next fixed signal
- Speed is track speed
- Next signal will display a proceed aspect
Describe a Normal Speed Warning signal and explain what it means
Yellow light above Red light.
- Points, if any, are set
- Track ahead is clear up to the next fixed signal
- Speed is track speed BUT you need to reduce speed in preparation for:
- Next signal will display STOP
Describe a STOP Signal and explain what it means
Two red lights above each other.
- Points may or may not be set
- Track ahead may or may not be occupied
- Speed is STOP - DO NOT PROCEED
- Next signal: Driver doesn’t know
Describe a Reduce to Medium Speed signal and explain what it means
Yellow light above a green light.
- Points are set
- Track ahead is clear up to the next fixed signal
- Speed is track speed for this section BUT you must be at 40km/h by the time you reach the next fixed signal
- Next signal will most likely be a Clear Medium Speed or Medium Speed Warning (40km/h for this section)
Describe a Clear Medium Speed signal and explain what it means
Red light above a green light.
- Points are set
- Track ahead is clear up to the next fixed signal
- Speed is Medium speed (40km/h) for the entire length of this section up to next fixed signal
- Next signal will display a PROCEED aspect
Describe a Medium Speed Warning signal and explain what it means
Red light above a yellow light.
- Points are set
- Track ahead is clear
- Speed is Medium speed (40km/h) for the entire length of this section up to next fixed signal BUT you must reduce speed and prepare for:
- Next signal will display STOP
Can you have a Low Speed Caution Signal aspect on an automatic signal?
No. Only on Home Signal (yellow below two red lights) and Dwarf (Yellow light)
Describe a Low Speed Caution signal on a home signal and explain what it means
A yellow light below 2 red lights. Only found on Home Signals. - Points are set - Track ahead may or may not be occupied - Speed is MAX 15km/h - Be prepared to stop - Next signal: Driver doesn't know
Is it possible to have a green light above a yellow light on a home or automatic signal?
No (unless we haven’t learned that one yet!)
Only yellow above green = Reduce to Medium Speed aspect
What are Low Speed Caution aspects used for?
Running line to siding
Running line to running line: mostly used for the purpose of forming a 6 car train with two 3 car trains.
When can a Low Speed Caution aspect NEVER BE USED?
It can never be used for train movement into a bi-directional section of the track
What train movements do Dwarf Signals control?
R-R: Running line to running line
R-S: Running line to siding
S-R: Siding to running line
S-S: Siding to siding
What do Home signal protect - Where are they fixed?
SSSLJ S: Stations S: Sidings S: Signal boxes L: Level Crossings J: Junctions
Can you pass a Home Signal at STOP?
Complicated question, the standard Metro Academy answer is “NO, Except..”
I refer you to exceptions to pass abs/atc cards 😎
Can you pass an Automatic Signal at STOP?
It may be passed at the Stop position according to the Rule 1 Section 3 of the book of rules and regulations.
Can you pass a Dwarf Signal at STOP?
“No, EXCEPT”
How does a Track Circuit work?
- As the train enters the Track Section, the leading wheels move past the relay area and form a shortened circuit.
- This causes the signal to revert to STOP.
- The driver following this train will see the signal at STOP position and stops
- As the train clears the track section, the signal will display a proceed aspect, allowing the train waiting behind to proceed.
- It prevents more than 1 train entering an occupied track section
How does an Axle Counter work?
- As the train passes the axle counter, it records the number of axles passing that point and sends the data to the signal in advance and read.
- If the numbers match as the train passes, the axle counter detects the train and changes the signals at the rear to protect the occupied track section.
Illuminated Number 65 or 80 on a Home - What does that mean?
Indicates to the driver that the points ahead are high speed points instead of normal 40km points, enabling them to be traversed at higher speed
Describe a Stop aspect on a Dwarf signal and what it means?
Red or Purple light.
- Points may or may not be set
- Track ahead may or may not be occupied
- Speed is STOP - Do not proceed
- Next signal: Driver doesn’t know
Describe a Low Speed Caution aspect on a Dwarf signal and what it means?
Yellow light.
- Points are set
- Track ahead may or may not be occupied
- Speed is 15km/h - Proceed cautiously and be ready to stop
- Next signal: Driver doesn’t know
Describe a Clear Low Speed aspect on a Dwarf signal and what it means?
Green light.
- Points are set
- Track ahead is clear to the next fixed signal
- Speed is 15km/h - Proceed cautiously and be ready to stop
- Next signal will display a proceed aspect
What aspects can two position signals display?
- Stop
- Proceed
Name the 2 position signal types
- Light Type
- Disc Type
Name the classes of two position signals
- Disc
- Dwarf
- Home
- Calling on
What are two position home signals fixed to protect?
- Stations
- Signal boxes
- Sidings
- Level Crossings
- Junctions
Name the aspect and meaning of a two position home Red signal
Aspect
-Danger/Stop
Points
-Points ahead may or may not be set for the move
Track
-The track ahead may or may not be occupied
Train Control
-The driver should be stopped with the reverser set into the off position for a Comeng, off or neutral for a Siemens or Xtrapolis train
Next Signal
-Driver will not know the aspect of next signal
Name the aspect and meaning of a green home two position signal
Aspect
-Proceed
Points
-Points if any are set for the move
Track
-Track is clear to the next fixed signal
Track
-Proceed at either track speed or other speed as appropriate
Next signal
-The signal does NOT give an early indication of the next signal aspect and the driver must be prepared to STOP should it be displaying a Stop/Danger aspect
What is a disc signal?
A disc signal is a class of two position signal described as a red circular target that can be turned to the side
What are disc signals used to control train movements from?
- Running line to running line
- Running line to siding
- Siding to siding
- Siding to running line
What two aspects do disc signals display?
- Stop
- Proceed
Explain what a red disc signal means?
Aspect
-Stop
Points
-Points ahead may or may not be set for move
Track
-The track ahead may or may not be occupied
Train Control
-The driver should be stopped with the reverser set into the off position for a Comeng, off or neutral for a Siemens or Xtrapolis train
Next Signal
-Driver will not know the aspect of next signal
What is the aspect and meaning when a disc signal is turned to the side by day or a green light by night?
Aspect
-Proceed
Points
-Points if any are set for the move
Track
-Track ahead may or may not be occupied
-Proceed at “reduced speed cautiously” being prepared to stop short of any obstruction
Next signal
-Reduced speed cautiously being prepared to stop at any obstruction
-The signal does NOT give an early indication of the next signal aspect and the driver must be prepared to STOP should it be displaying a Stop/Danger aspect
What do two position 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 a two position dwarf signal display?
- Red
- Purple
- Green
- Yellow
How many aspects can two position light type dwarf signals display and what are they?
Three
- Stop - Red or purple
- Proceed - Green
- Siding Dwarf - Yellow in same post as a dwarf
What colours display a stop aspect on two position dwarf signals?
Red or purple
What does a red or purple top light on a two position dwarf signal mean?
Aspect
-Stop
Points
-Points ahead may or may not be set for move
Track
-The track ahead may or may not be occupied
Train Control
-The driver should be stopped with the reverser set into the off position for a Comeng, off or neutral for a Siemens or Xtrapolis train
Next Signal
-Driver will not know the aspect of next signal
What does a green light on a two position dwarf signal indicate?
Aspect -Proceed Points -Points are set for the move Track -Track ahead may or may not be occupied -Proceed cautiously being prepared to stop short of any obstruction Next signal -The signal does NOT give an early indication of the next signal aspect and the driver must be prepared to STOP should it be displaying a Stop/Danger aspect
What does it mean when a yellow dwarf signal with siding underneath it is placed onto the same post as a home signal?
Yellow light on - Proceed
Yellow light off -Normal
Dwarf signal is provided for shunting movements into sidings only.
There must be a board with the word siding on it
What does it mean when a yellow dwarf signal with a board saying siding beneath it on the same post as a home signal is illuminated?
Aspect -Proceed Points -Points are set for the move Track -Track ahead may or may not be occupied -Proceed cautiously being prepared to stop short of any obstruction Next signal -The signal will most likely be a Buffer light at stop position
Can the yellow siding dwarf signal on the same post as a home signal give you access to the same line as the home signal?
No it will only give you access to the sidings
Where are two position signals in use on the metro network?
They are only in effect in Frankston
What does it mean if a signal box is “Switched out”
It means the signaller is off duty and the signal box is considered unattended
Can you pass a home signal with an illuminated A and if so how?
If the A is illuminated it is now operating in fleeting mode/signal box switched out and can be passed using rule 1 section 3
What is the purpose of all signalling systems?
To communicate to the driver the state of the line ahead and give the driver authority to proceed when it’s safe to do so.
Illuminated letter ‘A’ on a Home - What does that mean?
- Points are set for the mainline.
- This signal is now operating as an Automatic signal
- Rules to pass it are the same as automatic
What is the proceed speed with a 2 position dwarf signal?
Proceed cautiously being prepared to stop short of any obstruction
Irregular dwarf signal stuck at proceed
What is the procedure?
Stop
Hand signaller placed holding a red flag
Hand signaller is not the authority to proceed past the red signal
NO ATWS IN SIDINGS
3 position home or auto stuck at proceed, what is the procedure?
2 ATWs
Hand signaller placed holding red signal
Relevant authority to pass the signal
What is the drivers responsibility when a rec call is broadcasted?
Stop for 60 seconds
Listen if the rec call is attributed to your line
If there is no immediate danger to you drive at extreme caution to the first signal at stop, platform or point of danger and wait for train control to declare all trains can move again
If no contact from train control contact them and get permission to move
Who can offer special instructions to the contrary when passing an automatic signal?
Rail safety manager
How are signals read on the same post?
Top to bottom
Left to right
Where do the KM posts indicate the distance from?
Southern cross
Where do the stanchion numbers indicate the distance from?
Fss
