Section 6: Responding to network signals and Indicators/signs Flashcards
(104 cards)
A signal
a trackside piece of infrastructure that provides the train crew a visual indication of the status of the track ahead of the intended movement
Train Crew and Qualified workers directing shunting and propelling movements must obey the indications and instructions displayed by
signals, indicators and signs
Conditions Affecting the Network information may be recorded on a
CAN form.
CAN form
an advice form to drivers warning of conditions affecting the network such as defective level crossings and other associated infrastructure
If a train is standing at a signal, the Network Controller MUST NOT change the indication of the signal to a more restrictive aspect unless
there is a CAN or the route needs to be altered and it is safe to do so
A running signal authorises
a through movement between that signal and the next running signal
A subsidiary signal does not give confirmation that
the line ahead is completely clear from a through train movement
If a shunting/subsidiary signal is used to authorise (RED/RED, Small steady yellow) rail traffic to pass a running signal at STOP train crew must
Proceed at restricted speed
A proceed indication by a shunting signal is an authority to PROCEED up to and not beyond the first of the following limits reached
shunt limit sign, stop sign, indicator showing the points are not set, catch points are open or a derail device is set, set of non interlocked points, signal for the direction of travel
A Network Controller may use a subsidiary shunting signal to authorise rail traffic to pass a home signal, if the running signal
fails to clear or cannot be cleared because rail traffic occupies the line beyond the signal
If the appropriate running or shunting signal cannot be cleared for the intended movement then the rail traffic movement must be made in accordance with
rule NSG 608 passing signals at STOP, whereby a Special Proceed authority may need to be compiled in some circumstances
Special Proceed Authority
a form used to authorise rail traffic movements when the Proceed Authority normally provided by the system of Safeworking in operation is not available
The SPA form is usually
compiled by train crew as dictated by the Network controller, then repeated back to the Network controller and confirmed as correct if read back exactly as dictated
If both a co-acting signal and the associated primary signal display stop,
Rail traffic may pass the co-acting signal, but must STOP at the associated primary signal
Signals may be passed at STOP by rail traffic only in accordance with
the relevant network Rule NSG 608 - Passing Signals at Stop and may require a Special Proceed Authority (SPA) form to be compiled
CLOSE UP signals indicate
that the line to the next signal is not occupied. They authorise rail traffic to PROCEED, but to expect the next signal to be at STOP
What does a CLOSE UP signal look like
RED or RED/RED with a subsidiary that has “CLOSE UP” sign on it
What doe LOW SPEED signals look like?
Small in line green light. RED or RED/RED with little green
Low speed aspects indicate
that the line to the next signal is not occupied. They authorise traffic to PROCEED but to expect: the next signal to be at STOP and the line beyond the next signal to be occupied
A PROCEED indication shows that
interlocked points protected by the signal are set in the correct position for the movement and no conflicting route has been set. The block is unoccupied as far as the next running signal
A PROCEED indication by a shunting signal does not indicate
that the block ahead is unoccupied - a shunting signal will not show a clear indication (green)
A fixed signal indication must be treated as STOP if
it is an illegal signal indication, there is no indication, there is no indication other than the route indicator or it is not understood
A signal indication is illegal if it is not consistent with
the aspects and indications used in the railway network, the indications of adjoining signals and the known condition of the line, what is known about the occupancy of the line
Qualified Workers must report illegal signal indications to
the Network control officer responsible for the portion of line. Affected signals must not be used to provide PROCEED indications before they can been certified back into use