Absolute Block (AB) Flashcards
What does this signal mean in the horizontal position?
CAUTION be prepared to stop at the NEXT stop signal,
or Any OTHER stop signals controlled by the SAME signal box in THAT direction.
In darkness/poor visibility YELLOW light is displayed.
What does this signal mean?
ALL ASSOCIATED stop signals CONTROLLED by the SAME box are in the CLEAR position.
In darkness/poor visibility the Green light is displayed.
What does this signal mean?
DANGER - STOP
In darkness / poor visibility a RED light is displayed
Also known as the HOME or SECTION signal
What Does This Mean?
The next signal will always be at Danger or the speed of the train will need to be reduced.
Where would this signal be found?
Dead End Stations
Loops
Sidings
Level Crossings
Single Lines
What does this ID indicate?
This indicates that it is a distant signal (White Triangle or the Letter R) the letter “R” stands for repeater as it is repeating the state of the next signal)
What is the overriding rule, regarding Block Sections
ONE TRAIN IN ONE SECTION AT ONE TIME
Service Braking Distance
The distance it takes for the driver to stop the train
Clearing Point
A 400mtr buffer places beyond every HOME signal. The train must pass the clearing point before another train is authorised to enter the block section. This is to prevent collisions and preserve the principal ONE TRAIN IN ONE SECTION AT ONE TIME
BLOCK SECTION SIGNAL CONTROL
DISTANT SIGNAL
Instructs the driver how to proceed to the next signal (HOME SIGNAL) and cannot show a stop signal
HOME SIGNAL
places at the entrance to a signal box known as the STATION LIMITS
SECTION SIGNAL
Placed at the entrance to the BLOCK SECTION
What signals does the STATION LIMITS sit between?
HOME SIGNAL AND THE SECTION SIGNAL
Name the items or Areas?
A> Distant Signal
B> Home Signal
C> Section Signal
E> Block Section
Name the Areas?
A> Distant Signal
B> Home Signal
C> Section Signal
D> Service Breaking Distance
E> Absolute Block Section
f> 400mtr Clearing Point
G> Station Limits
Name the Areas?
A> Distant Signal
B> Home Signal
C> Section Signal
D> Service Breaking Distance
E> Absolute Block Section
f> 400mtr Clearing Point
G> Station Limits
Name The Areas?
A> Distant Signal
B> Home Signal
C> Section Signal
D> Service Breaking Distance
E> Absolute Block Section
f> 400mtr Clearing Point
G> Station Limits
H> Intermediate Block Section
I*> Absolute Block Section
1> Intermediate Block Distant Signal
2> Intermediate Block Home Signal
What does this Diamond Sign Mean?
The presence of a train is indicated by a TRACK CIRCUIT
What does the T stand for in the Track Circuit Indicator Plate?
Signal is Equipped with a Telephone
