Signals Flashcards
What are the two families of signals?
Stop signal and a distant signal
What is a stop signal?
A stop signal is a signal that can display a stop aspect or indication
You must stop at a stop signal when it displays a red aspect
What is a distant signal?
A distant signal is a signal that cannot display a stop aspect or indication
A distant signal can only display a proceed or proceed with caution
How can you identify a distant signal?
A distant signal can be identified by either an R at the bottom of the identification plate or a solid triangle at the top
What is a controlled signal?
A signal operated by the signaller
Where would you see a controlled signal?
Controlled signals are normally placed at areas that are dangerous, such as junctions, entrances/exits of stations, and loops
How can you identify a controlled signal?
What is an automatic signal?
A signal operated by the passage of trains
How can you identify an automatic signal?
It has a rectangular white plate with a black stripe through it above the normal signal ID plate
What is a semi-automatic signal?
A signal normally operated by the passage of trains but can also be controlled from a signal box or a ground frame
How can you identify a semi-automatic signal?
What is a 2 State Banner Repeater?
Banner repeating signals are provided on the approach to certain signals that have restricted sighting to give advanced information of the signsl aspect
How can you identify a 2 State Banner Repeater?
It will have BR written at the bottom of the ID plate
What is this?
A 2 State Banner Repeater
What is a 3 State Banner Repeater?
3 State Banner repeaters can show 3 indications
Banner repeating signals are provided on the approach to certain signals that have restricted sighting to give advanced information of the signal aspect
How can you identify a 3 State Banner Repeater?
What is this?
A 3 State Banner Repeater
What is a Co-Acting Signal?
A Co-Acting Signal is provided to give both short and long distance sighting of the signal
A co-acting signal repeats the exact aspect or indication of the main aspect
How can you identify a Co-Acting Signal?
It will have a T on the signal ID plate
What is a junction indicator?
A junction indicator is provided to show that a train is being signalled to a route to the left or right of the straight route
How are the junction indicators labelled?
What is a Route Indicator?
At some locations, a route indicator is provided at the signal
The indicator will display either a letter or a number to show the route onto which the movement is being signalled
What is this?
A GPL Ground Position Light
What is this?
An APL Associated Position Light
What two aspects can a semaphore signal display?
Danger and proceed
What two aspects can a semaphore distant signal display?
Caution and clear
What aspect can a fixed distant signal display?
Permanant caution
what is a subsidary signal?
Semaphore subsidary signals are always associated with the main arm of the semaphore stop signal
The subsidary signal will always be positioned below the main Semaphore arm, which it is associated with, and on the same signal post
What does it mean when the subsidary is in the normal position?
It means obey the main arm
In semaphore signalling how is route indication displayed?
Stepping
How can you tell if a signal is out of use?
It will be covered in a black bag with a white cross over it or a white x nailed to the semaphore
What should you do if you come across an imperfectly exhibited signal?
contact the signaller to get confirmation on what aspect the signal is showing
What are the two types of detection systems?
track circuit and axle counters
What are the two types of detection systems?
track circuit and axle counters
What is absolute block signalling?
A system that only allows one train to occupy a defined section block at a time
Each block section is manually controlled by a signaller who communicates via a block instrument
contains a distant, home, section, distant, home and section signal
What is intermediate block?
Intermediate block sections are provided to increase track usage in areas with absolute block in operations where the distances between successive stations are large
An intermediate block section is an additional block section that does not necessarily correspond to any station and which is provided solely to decrease block lengths
