Signalling - Part 3 Flashcards
What are position lights also known as?
Ground position lights
Where are position lights found?
in sidings, deports or locations where a shunt is required
What does a limit of shunt sign look like on a position light signal?
Two red lights horizontally - never change
What is the sequence of a 4 aspect signal?
Green
Double yellow
Yellow
Red
What is the sequence of a 3 aspect signal?
Green
Yellow
Red
What is an IBJ?
Insulated block joint
What does a 2 aspect signal system consist of?
DISTANT signal and STOP signal
How do you identify a 2 aspect distant signal?
With a white triangle symbol or an “R”
What is the 2 aspect sequence?
Green
Yellow
Red
A signal plate comprises of……
- signal type
- prefix (related to the signal box to which it
applies) - signal number
How are automatic signals operated?
Through the passage of trains
How do you identify an automatic signal?
It will have a white signal post plate with a horizontal black stripe
How is a controlled signal operated?
Either by
a signal box (by a person)
OR
a ground frame (by a person)
How can you identify a controlled signal?
It will have a black signal post plate showing the signal number
How does a semi-automatic signal operate?
Either by
- the passage of trains
or
- can be operated from a signal box or a ground frame (by a person)
How can you identify a semi-automatic signal?
It is identified by a white signal post plate with a black horizontal stripe and the word ‘SEMI’ above the stripe. The signal number
may be shown on the plate
