Module 2 Flashcards
Purpose of fixed signals in absolute block 4+1
Control train movements
To protect train or obstruction
To stop conflicting movements
Interlocked with signals
Usually on the left hand side
Types of signal x4
Fixed , distant , shunt and subsidiary
Absolute Block ( describe and explain) think H1 ect
H1. H2. SS
—————
Station limits
SS. Distant. H1
————————
Block section
Block instrument failure speed
50mph
Who controls signal box
Control from the rear
Release from advance
Sectional appendix
KSW1=
general info and locations
KSW2=
Route maps and local instructions
KSWRC=
Route clearance
Track circuit block (describe or explain )
From 1 Stop signal. To. 2nd Stop signal + overlap
————————————————————
= signal section
PoSA what is it and what must happen
PoSA means Passed on signallers authority.
And two white lights must be flashing if you are to pass the main signal at danger
Proceed at caution being prepared to stop
AWS indicators must cancelled and disregarded
Obey the next signal
High speed diverging junction ( describe the signal)
Two yellow flashing lights followed by on flashing yellow light followed by a single fixed yellow light
Intermediate block section signal and what does it do
White plate with black vertical line
It is to shorten a block section and allow more than one train in a at one time
TCB signal (are ,except)
Are fully automatic and controlled by the passage of trains
Except at large stations and junctions
High SPAD signal description
A signal in blue or surrounded in blue
