lineside signal aspect and indication … iss 1.pdfrssb page 3 of 37 railway group standard...

Railway Group Standard

GK/RT0058

Issue One

Date December 2014

Lineside Signal Aspect and Indication Requirements

Synopsis

This document mandates the appearance of lineside signalling system displays and the information they convey.

This document contains one or more pages which contain colour

Copyright in the Railway Group Standards is owned by Rail Safety and Standards Board Limited. All rights are hereby reserved. No Railway Group Standard (in whole or in part) may be reproduced, stored in a retrieval system, or transmitted, in any form or means, without the prior written permission of Rail Safety and Standards Board Limited, or as expressly permitted by law.

RSSB Members are granted copyright licence in accordance with the Constitution Agreement relating to Rail Safety and Standards Board Limited.

In circumstances where Rail Safety and Standards Board Limited has granted a particular person or organisation permission to copy extracts from Railway Group Standards, Rail Safety and Standards Board Limited accepts no responsibility for, nor any liability in connection with, the use of such extracts, or any claims arising therefrom. This disclaimer applies to all forms of media in which extracts from Railway Group Standards may be reproduced.

Published by: RSSB Block 2 Angel Square 1 Torrens Street London EC1V 1NY © Copyright 2014 Rail Safety and Standards Board Limited

Uncontrolled When Printed Document comes into force 07/03/2015 Supersedes parts of GKRT0045 Iss 3 as of 07/03/2015 - Please refer to Issue Record for more information Superseded by RIS-0758-CCS Iss 1 with effect from 03/03/2018

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Issue record

Issue Date Comments

One December 2014 Original document.

This standard is the result of an analysis of technical compatibility between lineside signalling systems and train operations. The requirements set out in this standard are consistent with the development of products that are capable of being interpretable, which is a pre-requisite of obtaining an authorisation for placing a new or modified lineside signalling system into service.

Superseded documents

The following Railway Group Standard is superseded, either in whole or in part as indicated:

Superseded documents Sections superseded Date when sections are superseded

GK/RT0045 issue three Lineside Signals, Indicators and Layout of Signals

2.1.1a; 2.1.1b; 2.1.2; 2.2.1.1; 2.2.1.2a; 2.2.1.2b; 2.2.1.3a; 2.2.1.3b; 2.2.1.4a; 2.2.1.4b; 2.2.1.4c; 2.2.1.4d; 2.2.2.2; 2.2.4.7; 2.2.4.8; 2.2.5.3; 2.2.5.5; 2.2.5.6; 2.2.5.8a; 2.2.5.8b; 2.2.6.1; 2.2.6.5; 2.2.6.6; 2.2.6.9; 2.2.7.2; 2.2.7.5; 2.2.8.3; 2.2.8.5; 2.3.1.1; 2.3.1.5; 2.3.2.5; 2.3.3.2; 2.3.3.3; 2.4.1.2; 2.4.2.2; 2.4.3.2; 2.4.5.2; 2.4.6.5; 2.4.6.6; 2.4.7.3; 2.4.8.2; 2.4.8.7a; 2.4.8.7b; 2.5.1.1a; 2.5.1.1b; 2.5.2.1; 2.5.3.1a; 2.5.3.1b; 4.1.8; 7.1.1; 7.2.1; 7.3.1; 7.3.2

07 March 2015

GK/RT0045 issue three Lineside Signals, Indicators and Layout of Signals, ceases to be in force and is withdrawn as of 07 March 2015.

Supply

The authoritative version of this document is available at www.rgsonline.co.uk. Uncontrolled copies of this document can be obtained from Communications, RSSB, Block 2, Angel Square, 1 Torrens Street, London EC1V 1NY, telephone 020 3142 5400 or e-mail [email protected]. Other Standards and associated documents can also be viewed at www.rgsonline.co.uk.


http://www.rgsonline.co.uk/

mailto:[email protected]


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Contents

Section Description Page

Part 1 Purpose and Introduction 5 1.1 Purpose 5 1.2 Introduction 5 1.3 Approval and authorisation of this document 5

Part 2 Requirements for Lineside Signal Aspect and Indication Requirements 6 2.1 Signal aspect and indication appearance 6 2.2 Signal aspect and indication combinations 7 2.3 Signal aspect and route indication combinations 8 2.4 Signal aspects and supplementary indication combinations 9

Part 3 Application of this document 10 3.1 Scope 10 3.2 Exclusions from scope 10 3.3 General compliance date 10 3.4 Exceptions to general compliance date 10 3.5 Health and safety responsibilities 11

Appendices Appendix A Information Conveyed by Lineside Signals 12 Appendix B Information Conveyed by Route Indicators 27 Appendix C System Status Information Conveyed by Lineside Indicators 30 Appendix D Operational Information Conveyed by Lineside Indicators 33

Definitions 35

References 37

Tables Table 1 Displays that convey signalling information 6 Table 2 Signal aspects that use display combinations 7 Table 3 Permitted signal aspect and route indication combinations 8 Table 4 Signal aspect and supplementary indication display combinations 9 Table A.1 Stop aspects 12 Table A.2 Shunting conditional stop aspects 13 Table A.3 Shunt aspects 13 Table A.4 Calling-on aspects 14 Table A.5 PoSA aspects 15 Table A.6 Cautionary aspects in 3-aspect TCB signalling areas 15 Table A.7 Preferred cautionary aspects in 4-aspect TCB signalling areas 16 Table A.8 Non-preferred cautionary aspects in 4-aspect TCB signalling areas 16 Table A.9 TCB unrestricted proceed-aspects 17 Table A.10 Distant signal aspects 18 Table A.11 Home signal and non-block stop signal OFF aspects 19 Table A.12 Section signal and intermediate block home signal OFF aspects 20 Table A.13 Junction approach flashing cautionary aspects 21 Table A.14 Junction approach splitting cautionary and unrestricted proceed-aspects 23 Table A.15 Banner repeater indications 23


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Table A.16 Splitting banner repeater indications 26 Table B.1 Junction indications 27 Table B.2 Preliminary junction indications 28 Table B.3 Alphanumeric route indications 29 Table C.1 Locally monitored infrastructure not operated indication 30 Table C.2 Facing points set indication 30 Table C.4 Locally monitored level crossing indications 31 Table C.4 TPWS indications 31 Table C.5 Mechanical trip-cock test indications 32 Table D.1 Train dispatch indications 33 Table D.2 Loading / unloading indications 34


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Part 1 Purpose and Introduction

1.1 Purpose

1.1.1 This document mandates requirements for lineside signal aspects and indications and the information that they are used to convey.

1.2 Introduction

1.2.1 Background

1.2.1.1 Lineside signalling systems are provided by infrastructure managers to convey the following types of information to authorised users involved with train operations:

a) Movement authority information.

b) Routing information.

c) Permissible speed information.

d) Locally monitored infrastructure status information.

e) Operating instructions.

1.2.1.2 The information is conveyed in the form of signal aspects, route indications, lineside operational signs and other signalling indications. Authorised users read the information being conveyed on the basis of the appearance of what is being displayed.

1.2.1.3 This document specifies the appearance and information conveyed by lineside signal aspects and indications so that they are interpretable and therefore compatible with the requirement that an authorised user should be able to understand the information being conveyed.

1.2.1.4 The scope of this document does not include compatibility of lineside signal aspects and indications with train driving processes when an in-cab signalling system is in use.

1.2.2 Related requirements in other documents

1.2.2.1 The following Railway Group Standard contains requirements that are relevant to the scope of this document:

GK/RT0070 Signalling Layout Design Requirements [in preparation, will

replace some parts of GK/RT0045]

GE/RT8102 Signalling Layout Driveability Assessment Requirements [in

preparation, will replace some parts of GK/RT0045]

1.2.3 Supporting documents

1.2.3.1 The following Rail Industry Guidance Note supports this Railway Group Standard:

GK/GN0658 Guidance on Lineside Signal Aspect and Indication Requirements

1.3 Approval and authorisation of this document

1.3.1 The content of this document was approved by Control Command and Signalling (CCS) Standards Committee on 16 October 2014.

1.3.2 This document was authorised by RSSB on 24 October 2014.


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Part 2 Requirements for Lineside Signal Aspect and Indication Requirements

2.1 Signal aspect and indication appearance

2.1.1 Each lineside signal shall continuously present the relevant signal aspect, except where the signal is configured with approach lighting functionality.

2.1.2 A signal shall be configured with approach lighting functionality only if both of the following criteria apply:

a) The signal does not contribute to the overall readability of signals on other lines.

And

b) The relevant signal aspect is readable whenever the signal is approached by a train on the line to which it applies.

2.1.3 The interruption of signal aspects and indications that are not designed to flash shall not exceed a single period of 250 mS in any one hour.

2.1.4 Signalling information shall be conveyed using only the signal aspects and indications set out in Table 1.

Type of information being conveyed

Conveyed by

Clause or Table reference

Individual displays

Display combinations

Movement authority (MA)

Signal aspect Tables A.1 to A.14 2.2

Repeat MA Banner repeater indication Table A.15 Not applicable

Routing Junction indication Table B.1

2.3 Alphanumeric indication Table B.3

Repeat routing Preliminary junction indication Table B.2 Not applicable

MA + routing

Semaphore junction signal OFF aspect

Tables A.9, A.11 and A.12

2.2

Flashing signal aspect Table A.13 Not applicable

Splitting distant signal aspect Not applicable Table A.14

Repeat MA + routing

Splitting banner repeater indication

Not applicable Table A.16

Locally monitored system status

Coloured light signalling indication Tables C.1 to C.5

2.4 Alphanumeric indication

Operating instruction

Coloured light signalling indication Tables D.1 and

D.2 Alphanumeric indication

Table 1 Displays that convey signalling information


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2.2 Signal aspect and indication combinations

2.2.1 Signal aspect combinations shall be presented only in accordance with Table 2.

Signal aspect type Display combination requirements

Subsidiary position light signal OFF aspects

A position light signal aspect presented with a colour light signal red aspect or stop board, as set out in A.3, A.4 or A.5.

Splitting distant signal aspects Two colour light signal aspects presented together, as set out in A.13.

Semaphore main stop and distant signal arm combinations

The distant arm shall:

a) Be positioned below the associated main stop arm and on the same signal post.

And

b) Be presented in the OFF position only when the associated main stop arm is also presented in the OFF position.

Semaphore main and subsidiary signal arm combinations

The calling-on (subsidiary) arm shall:

a) Be mounted below the associated main stop arm (and where provided, the associated distant arm), and on the same signal post.

And

b) Be presented in the OFF position only when the associated main stop arm is in the ON position.

Semaphore junction signal arm combinations

As set out in 2.2.2 and 2.2.3.

Co-acting signal aspects Duplicated signal aspects.

Table 2 Signal aspects that use display combinations

2.2.2 Semaphore junction signals that convey routing information using stepped, multiple stop arms shall meet the following principles:

a) A separate stop arm shall be provided for each route.

b) The relative horizontal position of each stop arm shall correspond with the direction of the applicable diverging route relative to the other signalled routes beyond the junction.

c) The uppermost stop arm shall apply to the route with the highest permissible speed.

d) The relative vertical position of the other stop arms shall correspond with the relative permissible speed on each diverging route.

2.2.3 Semaphore junction signals that convey routing information using stacked, multiple stop arms or discs shall meet the following principles:

a) A separate stop arm or disc shall be provided for each route.

b) The uppermost stop arm or disc shall correspond with the most extreme left-hand route.


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c) The relative vertical position of each additional stop arm or disc shall correspond with the extent of the divergence from left to right.

2.3 Signal aspect and route indication combinations

2.3.1 Junction signal aspect and route indication combinations shall be presented only in accordance with Table 3.

Junction signal type Junction signal aspect type

Permitted route indication type

All junction signals Stop aspect None (#1)

Colour light signal Proceed-aspect (#2) Junction indication

Colour light signal Proceed-aspect (#2) Alphanumeric indication

Colour light signal Proceed-aspect (#2) Junction indication

and

Alphanumeric indication

Semaphore signal Proceed-aspect Alphanumeric indication (#3)

Independent or subsidiary position light signal

Proceed-aspect Alphanumeric indication (#3)

#1 See 2.3.2; #2 See 2.3.3; #3 See 2.3.4

Table 3 Permitted signal aspect and route indication combinations

2.3.2 A route indication and stop aspect combination shall be presented only for route indication-proving purposes immediately before the proceed-aspect is presented.

2.3.3 A route indication shall not be presented in combination with any of the following signal displays:

a) Flashing single yellow.

b) Flashing double yellow.

c) Any splitting distant signal aspect where both signal heads are illuminated.

2.3.4 When an alphanumeric route indication is presented by a main stop signal that also incorporates a subsidiary signal aspect (unless the exception set out in 2.3.5 applies):

a) The alphanumeric route indications presented with main proceed-aspects shall be displayed in a different position to any alphanumeric route indications presented with the subsidiary aspect.

And

b) Any alphanumeric route indications presented with the subsidiary aspect shall appear to be at least 50% smaller than the alphanumeric route indications presented with the main proceed-aspects.


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2.3.5 A main stop signal shall present alphanumeric route indications that have a similar size and positional relationship with the main and subsidiary aspects only if the following criteria apply:

a) Physical environment and structure gauge limitations mean that compliance with 2.3.4 is not feasible.

And

b) A signal sighting assessment confirms that sufficient mitigation will be available to control the risk from a driver misreading the MA.

2.4 Signal aspects and supplementary indication combinations

2.4.1 Signal aspect and supplementary indication combinations shall be presented, only as set out in Table 4.

Signal type Signal aspect Permitted supplementary indication

Additional permitted supplementary indication

Stop signal (excluding stop board)

Stop aspect 'TT' None

All stop signals

Proceed-aspect

‘CD’ or ‘RA’ (#1)

None Loading / unloading indication

Flashing white light

Isolated distant signal

‘CD’ or ‘RA’ (#1) None

Banner repeater ON aspect None

Banner repeater OFF aspect 'CD' or 'RA' (#1) None

Stop board

(#2) Stop aspect

Flashing red light

Flashing white light Steady yellow light

Steady blue light

Flashing blue light

#1 Where both indications are presented at the same signal, the ‘RA’ indication shall supersede the ‘CD’ indication

#2 The stop board shall also present wording to convey any relevant operating instructions

Table 4 Signal aspect and supplementary indication display combinations


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Part 3 Application of this document

3.1 Scope

3.1.1 The requirements of this document apply to all work that affects lineside signal aspects and indications, whether new or alteration.

3.1.2 Where infrastructure is subject to modification or upgrade and the nature of the modification or upgrade provides a reasonable opportunity to bring the infrastructure into conformity, then the requirements of this document applicable to the alteration apply.

3.1.3 Action to bring existing lineside signal aspects and indications into compliance with the requirements of this document [or part of document] is not required.

3.1.4 Action to bring existing lineside signal aspects and indications into compliance is required when that part of the lineside signalling system is modified or renewed as a whole.

3.2 Exclusions from scope

3.2.1 The requirements in this standard are not applicable where an in-cab signalling system is in use.

3.3 General compliance date

3.3.1 This Railway Group Standard comes into force and is to be complied with from 07 March 2015.

3.3.2 After the compliance date, or the date by which compliance is achieved, if earlier, compliance with the requirements set out in this Railway Group Standard is to be maintained. Where it is considered not reasonably practicable to comply with the requirements, permission to comply with a specified alternative should be sought in accordance with the Railway Group Standards Code.

3.4 Exceptions to general compliance date

3.4.1 There are no exceptions to the general compliance date specified in 3.3.

3.4.2 It is permissible to designate specific infrastructure projects, at an advanced stage of development when this document comes into force, for which compliance with the requirements of this document applicable to the design, construction and commissioning of new or altered infrastructure is not mandatory. When designating such projects, the following shall be considered:

a) Its responsibilities under its current safety authorisation.

b) The stage reached by the project at the time this document comes into force (for example, approval in principle).

c) Whether compliance is necessary to ensure compatibility with other parts of the infrastructure.

d) Whether compliance is necessary to facilitate the safe working of the railway system having regard to changes to related requirements mandated on another infrastructure manager or a railway undertaking.

e) The economic impact of compliance, but subject to its current safety authorisation in relation to the infrastructure in question.


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3.4.3 Where any designations are made for infrastructure projects, those projects shall continue to meet the equivalent requirements in the RGSs applying to the project before the designation.

3.5 Health and safety responsibilities

3.5.1 Users of documents published by RSSB are reminded of the need to consider their own responsibilities to ensure health and safety at work and their own duties under health and safety legislation. RSSB does not warrant that compliance with all or any documents published by RSSB is sufficient in itself to ensure safe systems of work or operation or to satisfy such responsibilities or duties.


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Appendix A Information Conveyed by Lineside Signals

The content of this appendix is mandatory

A.1 Limit of MA

Conveyed information Description Example Designation

MA information:

Limit of MA

Colour light signal head generating the red display

Main stop aspect

Semaphore main stop arm horizontally aligned (+5o, -5o) and a red signal light

Stop board

Stop

Retro-reflective buffer beam in combination with two buffer-stop lights vertically aligned

(#1)

Independent position light signal generating the PLS red ON display

Shunting stop aspect

Semaphore miniature stop arm horizontally aligned (+5o, -5o) and a red signal light

Semaphore shunting disc horizontally aligned (+5o, -5o) and a red signal light

#1 Buffer-stop lights coloured either signal red or signal white

Table A.1 Stop aspects


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A.2 Limit of MA on the signalled route


MA information

Limit of MA for train movements towards a signalled line

Independent position light signal generating the PLS yellow ON display

Non-preferred

Shunting conditional stop aspect

Table A.2 Shunting conditional stop aspects

A.3 Shunting MA


MA information:

Shunting MA.

The line ahead might be occupied.

Routing information:

(#1)

Independent position light signal generating the PLS steady OFF display

Shunt aspect

Semaphore shunting disc aligned at 45o (+20o, -10o) above or below horizontal and a green signal light

(upper quadrant is shown)

Semaphore miniature stop arm aligned at 45o (+20o, -10o) above or below horizontal and a green signal light


MA information:

Shunting MA.

The line ahead might be occupied.

A position light signal generating PLS steady OFF display in combination with a colour light signal head generating the red display

A position light signal generating PLS steady OFF display in combination with a stop board

Stop

#1 Section 2.2 sets out further requirements for conveying routing information using multiple semaphore signal arms and discs

Table A.3 Shunt aspects


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A.4 Calling on MA


MA information:

Calling-on MA.

The line ahead is occupied.

A position light signal generating PLS steady OFF display in combination with a colour light signal head generating the red display

Calling-on aspect

A semaphore calling-on arm aligned at 45o (+20o, -10o) above or below horizontal and a green signal light positioned below a semaphore main stop arm horizontally aligned (+5o, -5o) and a red signal light


Table A.4 Calling-on aspects


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A.5 Proceed-on-Sight Authority (PoSA) MA


MA information:

Proceed-on-sight authority (PoSA) MA

A position light signal generating PLS flashing OFF display in combination with a colour light signal head generating the red display

(#1)

Subsidiary PoSA aspect

A position light signal generating PLS flashing OFF display

(#1)

Independent PoSA aspect

#1 Flashing aspect parameters:

a) Flashing rate: 60 cycles per minute (+/-10).

b) Flashing pattern:

i) Lit for 50% - 66% of each flashing cycle.

ii) Flashing cycles shall be of equal length.

iii) Multiple display elements flash synchronously.

Table A.5 PoSA aspects

A.6 Cautionary MA in 3-aspect track circuit block (TCB) signalling areas


MA information:

Non-permissive MA.

One signal section is clear.

Signalling braking distance is available.

A colour light signal head generating the single yellow display

3-aspect caution

A fixed distant board

Table A.6 Cautionary aspects in 3-aspect TCB signalling areas


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A.7 Cautionary MA in 4-aspect TCB signalling areas (preferred)


MA information:

Non-permissive MA.

Two signal sections are clear.


A colour light signal head generating the double yellow display

4-aspect first caution

MA information:

Non-permissive MA.


At least 33% signalling braking distance is available.


4-aspect single yellow caution

Table A.7 Preferred cautionary aspects in 4-aspect TCB signalling areas

A.8 Cautionary MA in 4-aspect TCB signalling areas (non-preferred)


MA information: (#1 or #2)

Non-permissive MA.

Three signal sections are clear.



Non-preferred

4-aspect first caution

MA information: (#1)

Non-permissive MA.


Less than signalling braking distance is available.

Non-preferred

4-aspect additional double yellow caution


Non-permissive MA.


At least 33% signalling braking distance is available.


Non-preferred

4-aspect single yellow caution


Non-permissive MA.


Less than 33% signalling braking distance is available.

Non-preferred

4-aspect closing-up single yellow caution

#1 Part of YY – YY – Y – R cautionary aspect sequence

#2 Part of YY – Y – Y – R cautionary aspect sequence

Table A.8 Non-preferred cautionary aspects in 4-aspect TCB signalling areas


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A.9 Unrestricted MA in TCB signalling areas


MA information:

Non-permissive MA.

Line clear.


(#1)

A colour light signal head generating the green display

TCB unrestricted proceed-aspect

Semaphore main stop arm aligned at 45o (+20o, -10o) above or below horizontal and a green signal light


#1 Section 2.2 sets out further requirements for semaphore junction signal OFF aspects

Table A.9 TCB unrestricted proceed-aspects


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A.10 MA information conveyed by distant signal ON and OFF aspects


MA information:

End of MA at the associated home signal or non-block stop signal.

Signalling braking distance is available (#1).


Distant ON aspect (#2)


Semaphore distant arm horizontally aligned (+5o, -5o) and a yellow signal light

A fixed distant board

MA information:

All associated stop signals are OFF.

Next block or token section is clear, or the next signal is a non-block stop signal displaying a proceed aspect.


Distant OFF aspect (#3)

Semaphore distant arm aligned at 45o (+20o, -10o) above or below horizontal and a green signal light


#1 Except for repeat distant ON aspects

#2 Includes intermediate block distant ON aspect

#3 Includes intermediate block distant OFF aspect

Table A.10 Distant signal aspects


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A.11 MA information conveyed by home signal aspects and non-block stop signal aspects


MA information:

Non-permissive MA.



(#1)



Semaphore home signal OFF aspect

Non-block semaphore stop signal OFF aspect

MA information:

Non-permissive MA.



Colour light home signal yellow-OFF aspect

Colour light non-block yellow-OFF aspect

MA information:

Non-permissive MA.

All associated stop signals are OFF.


Colour light home signal green-OFF aspect

Colour light non-block green-OFF aspect


Table A.11 Home signal and non-block stop signal OFF aspects


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A.12 MA information conveyed by section signal aspects and intermediate block home signal aspects



Non-permissive MA.

Block, token or one-train staff section is clear.


(#2)



Section signal OFF aspect

Intermediate block home signal OFF aspect


Non-permissive MA.

Block, token or one-train staff section is clear as far as the home signal.



Colour light section signal yellow-OFF aspect (#3)


Non-permissive MA.

Block, token or one-train staff section is clear.


Colour light home signal green-OFF aspect

Intermediate block home signal OFF aspect

#1 Electric token block systems and one-train staff systems additionally require the transfer of a token or staff as part of the MA


#3 Also acts as a distant ON aspect

Table A.12 Section signal and intermediate block home signal OFF aspects


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A.13 Signal aspects that convey MA and routing information


MA information:

Non-permissive MA as far as the first signal beyond the junction.

SBD is available to the junction signal.


The next junction signal is displaying a cautionary aspect for a diverging route.

A colour light signal head generating the flashing double yellow display

(#1)

4-aspect outer junction approach flashing caution

A colour light signal head generating the flashing single yellow display

(#1)

3-aspect junction approach flashing caution

MA information:

Non-permissive MA as far as the first signal beyond the junction.

SBD is available.

At least 33% SBD is available to the junction signal.


The next junction signal is displaying a cautionary aspect for a diverging route.

A colour light signal head generating the flashing single yellow display

(#1)

4-aspect inner junction approach flashing caution

#1 Flashing aspect parameters:





iii) The flashing double yellow aspect shall flash in synchronism.

Table A.13 Junction approach flashing cautionary aspects


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MA information:

Non-permissive MA.




Principal set.

Two colour light signal heads combined as a junction splitting distant signal

Splitting distant straight ahead caution – right-hand junction

Splitting distant straight ahead caution – left-hand junction

MA information:

Non-permissive MA.




Left-hand diverging route set.

Splitting distant left-hand junction caution

MA information:

Non-permissive MA.




Right-hand diverging route set.

Splitting distant right-hand junction caution

MA information:

Non-permissive MA.

Line clear.


Principal set.

Splitting distant straight ahead unrestricted proceed-aspect – right-hand junction

Splitting distant straight ahead unrestricted proceed-aspect – left-hand junction


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MA information:

Non-permissive MA.

Line clear.


Left-hand diverging route set.

Splitting distant left-hand junction unrestricted proceed-aspect

MA information:

Non-permissive MA.

Line clear.


Right-hand diverging route set.

Splitting distant right-hand junction unrestricted proceed-aspect

Table A.14 Junction approach splitting cautionary and unrestricted proceed-aspects

A.14 Indications that repeat MA information


The repeated signal is displaying a main stop aspect

Banner repeater head displaying a horizontal banner arm against a white background

Banner-ON indication

The repeated signal is displaying a proceed-aspect

(#1)

Banner repeater head displaying an upper quadrant banner arm against a white background

Banner white- OFF indication The repeated signal is

displaying a cautionary aspect

(#2)

The repeated colour light signal is displaying a green aspect

(#2)

Banner repeater head displaying an upper quadrant banner arm against a green background

Banner green-OFF indication

#1 2-state banner repeater indicators only #2 3-state banner repeater indicators only

Table A.15 Banner repeater indications


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A.15 Indications that repeat MA and routing information


The repeated signal is displaying a main stop aspect.

Equal height splitting banner

Equal height splitting banner-ON indication

Two banner ON-indications presented side by side

Equal height splitting banner-ON indication

The repeated signal is displaying a proceed-aspect.

(#1)

The left-hand route is set. A banner white-OFF indication positioned to the left-hand side of a banner-ON indication

Splitting white banner-OFF indication (equal height left hand)

The repeated signal is displaying a cautionary aspect.

(#2)

The left-hand route is set.

The repeated colour light signal is displaying a green aspect.

(#2)

The left-hand route is set.

A banner green-OFF indication positioned to the left-hand side of a banner-ON indication

Splitting green banner-OFF indication (equal height left hand)


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(#1)

The right-hand route is set. A banner white-OFF indication positioned to the right-hand side of a banner-ON indication

Splitting white banner-OFF indication (equal height right hand)


(#2)

The right-hand route is set.


(#2)

The right-hand route is set.

A banner green-OFF indication positioned to the right-hand side of a banner-ON indication

Splitting green banner-OFF indication (equal height right hand)


(#1)

The higher speed left-hand route is set.

A banner white-OFF indication positioned higher than and to the left-hand side of a banner-ON indication

Splitting white banner-OFF indication (stepped left hand, higher speed route)


(#2)

The higher speed left-hand route is set.

The repeated colour light signal is displaying a green aspect

(#2)

The higher speed left-hand route is set

A banner green-OFF indication positioned higher than and to the left-hand side of a banner-ON indication

Splitting green banner-OFF indication (stepped left hand, higher speed route)


(#1)

The higher speed right-hand route is set.

A banner white-OFF indication positioned higher than and to the right-hand side of a banner-ON indication

Splitting white banner-OFF indication (stepped right hand, higher speed route)


(#2)



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(#2)


A banner green-OFF indication positioned higher than and to the right-hand side of a banner-ON indication

Splitting green banner-OFF indication (stepped right hand, higher speed route)


(#1)

The lower speed left-hand route is set.

A banner white-OFF indication positioned lower than and to the left-hand side of a banner-ON indication

Splitting white banner-OFF indication (stepped left-hand route)


(#2)



(#2)


A banner green-OFF indication positioned lower than and to the

left-hand side of a banner-ON indication

Splitting green banner-OFF indication (stepped left-hand route)


(#1)

The lower speed right-hand route is set.

A banner white-OFF indication positioned lower than and to the right-hand side of a banner-ON indication

Splitting white banner-OFF indication (stepped right-hand route)


(#2)



(#2)


A banner green-OFF indication positioned lower than and to the right-hand side of a banner-ON indication

Splitting green banner-OFF indication (stepped right-hand route)

#1 2-state splitting banner repeater indicators only #2 3-state splitting banner repeater indicators only

Table A.16 Splitting banner repeater indications


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Appendix B Information Conveyed by Route Indicators


B.1 Directional information



The principal route is set No junction indication is presented


The 1st left-hand diverging route is set

An illuminated white bar of light

‘X’ denotes the PIVOT end

X

Position 1 junction indication


The 2nd left-hand diverging route is set XX



The 3rd left-hand diverging route is set

XXX



The 1st right-hand diverging route is set X



The 2nd right-hand diverging route is set XX



The 3rd right-hand diverging route is set

XXX


Table B.1 Junction indications


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The principal route is set at the next diverging junction

An illuminated arrow indication (#1)

Position 0 preliminary junction indication


The 1st left-hand diverging route is set at the next diverging junction



The 2nd left-hand diverging route is set at the next diverging junction



The 3rd left-hand diverging route is set at the next diverging junction



The 1st right-hand diverging route is set at the next diverging junction



The 2nd right-hand diverging route is set at the next diverging junction



The 3rd right-hand diverging route is set at the next diverging junction


#1 No indication shall be presented when the junction signal is displaying a main stop aspect

Table B.2 Preliminary junction indications


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B.2 Route and destination information



The principal route is set No route indication is presented


The route is set towards the indicated destination

Any horizontally aligned combination of one, two or three upper case alphanumeric characters, as follows:

M

SDG

(Examples only)

Alphanumeric route indication

Preferred:

0 1 2 3 4 5 6 7 8 9

A B C D E F G H

K L M N P R

S T U W Y Z

Non-preferred:

I J O V


The route is set towards a limit of shunt or along a bi-directional line in the opposite direction to the normal flow of traffic

X (#1) X

#1 Where a signal has more than one contra-direction route, the relevant alphanumeric route indication shall combine the letter X with one or two additional characters

Table B.3 Alphanumeric route indications


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Appendix C System Status Information Conveyed by Lineside Indicators


C.1 Locally monitored infrastructure not operated


Locally monitored infrastructure not operated

A flashing red light

(#1)

Infrastructure not operated indication (#2)

#1 Flashing indication parameters:



i) Lit for nominal 20% of each flashing cycle.

ii) Each flashing cycle of equal length.

#2 Locally monitored infrastructure types include facing points and level crossings

Table C.1 Locally monitored infrastructure not operated indication

C.2 Locally monitored facing points status information


Locally monitored points are correctly set

A steady yellow light

Facing points set indication

Table C.2 Facing points set indication


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C.3 Locally monitored level crossing status information


Locally monitored level crossing operating correctly

A flashing white light

(#1)

Level crossing operating indication

Barriers are fully raised Alphanumeric indication

BU

(#2)

‘Barriers Up’ indication


a) Flashing rate: 60-90 cycles per minute.




#2 Absence of the indication implies that the level crossing has failed after passage of the train

Table C.3 Locally monitored level crossing indications

C.4 TPWS status information


TPWS intervention is set at the stop-board

A steady blue light

TPWS set indication

TPWS is disarmed at the stop-board

A flashing blue light

(#1)

TPWS disarmed indication

TPWS has failed No indication presented




i) Lit for nominal 20% of each flashing cycle.


Table C.4 TPWS indications


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C.5 Mechanical trip-cock system status information


Trip-cock test underway Alphanumeric indication

TT

Trip-cock test indication

Trip-cock test OK TT extinguishes

Table C.5 Mechanical trip-cock test indications


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Appendix D Operational Information Conveyed by Lineside Indicators


D.1 Train dispatch operation indications


The associated stop signal is displaying a proceed-aspect

Alphanumeric indication

OFF

(#2)

Signal OFF indication

The train has an MA (#1)

Close doors CD

(#3)

Close doors indication

Right away RA

(#3)

Right away indication

#1 In ETCS areas only, where the MA is not conveyed by a signal aspect

#2 Presented either on its own or in combination with a signal identity or direction identity

#3 Where an indicator displays CD and RA, the CD indication shall be presented first and the RA indication shall supersede the CD indication

Table D.1 Train dispatch indications

D.2 Loading / unloading operational information


Stop immediately Three red lights aligned horizontally

Stop indication

Prepare to stop

Three white lights aligned at 45o left hand raised

Position 1 shunting indication

Proceed forwards slowly

Three white lights aligned vertically



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Reverse slowly

Three flashing white lights aligned at 45o right hand raised

(#1)







iii) Multiple display elements flash synchronously.

Table D.2 Loading / unloading indications


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Definitions

Aspect

(See signal aspect).

Authorised user

A person authorised to carry out one or more operational roles defined in GE/RT8000 Rule Book. Authorised user roles include train driver, shunter, guard and platform staff.

Display (noun)

The overall appearance of the image generated by a lineside signalling product or feature.

Diverging junction

A type of junction incorporating one or more facing points ends where one signalled line splits into two or more separate signalled lines.

Diverging route

Any route at a diverging junction that is not designated as the principal route.

Indication

(See signal indication.)

Interpret / interpreting (signalling system displays)

The action of understanding the information conveyed by the signal aspect or indication after it has been read (for example, understanding that a red aspect means ‘end of MA’).

Interpretable (signalling system displays)

The extent to which the information conveyed by a signal aspect or indication can be reliably interpreted, ranging from not interpretable to easily interpretable.

Interpretability

The ease and reliability with which signal aspects and indications can be interpreted by an authorised user throughout the range of operational and ambient conditions applicable to that feature, within the operational context and while performing typical required duties. This ranges from never interpretable to always interpretable.

Junction signal

A main stop signal that protects a diverging junction.

Lineside operational sign

A sign, positioned at the lineside, that conveys information needed to support the train driving task.

Lineside signalling system

A system that is used to convey information about the movement authorities, routes, equipment status, operational information and permissible speeds in the form of lineside signal aspects, route indications, signalling indications and lineside signs.

Locally monitored system / infrastructure

A signalling system or train protection system that uses a lineside signalling indication to indicate its operational status to authorised users.

Movement authority (MA) information

Information conveyed by the lineside signalling system describing the permission for a particular train to run to a specific location within the constraints of the signalling system.


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Operational information

Operational information conveyed by the lineside signalling system describing an action to be taken by an authorised user.

Principal route

The signalled line beyond a diverging junction that has the highest permissible speed of all routes at the junction.

Route indication

A display of specified appearance that is used to conveying routing information to an authorised user.

Route indicator

A permanent, fixed feature of the lineside signalling system that is capable of displaying a route indication.

Routing information

Information conveyed by the lineside signalling system describing the route or destination that is associated with an MA.

Sign

A device that displays a fixed image or text, in order to convey specific information to the reader.

Signal

A permanent, fixed feature of the lineside signalling system that is capable of displaying a signal aspect.

Signal aspect / indication

A display of specified appearance that is used to convey a specific set of information to an authorised user.

Signalling braking distance (SBD)

The distance between the first signal exhibiting a cautionary aspect and the signal at which the train is required to stop.

Signalling indicator

A permanent, fixed feature of the lineside signalling system that is capable of displaying a signalling indication.

System status information

Information conveyed by the lineside signalling system concerning the operational status of a system or infrastructure feature that is designed to be monitored by authorised users.

Un-signalled line

The part of the railway that is operated without the use of lineside signals or indicators.


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References

The Catalogue of Railway Group Standards gives the current issue number and status of documents published by RSSB. This information is also available from www.rgsonline.co.uk.

RGSC 01 Railway Group Standards Code

RGSC 02 Standards Manual

Documents referenced in the text

Railway Group Standards

GE/RT8000 Rule Book

GE/RT8101 Signal Sighting Assessment Requirements [in preparation, will replace GE/RT8037]

GK/RT0045 Lineside Signals, Indicators and Layout of Signals

GK/RT0057 Lineside Signal and Indicator Product Design and Assessment Requirements

GK/RT0070 Signalling Layout Requirements [in preparation, will replace some parts of GK/RT0045]

RSSB documents

GK/GN0658 Guidance on Lineside Signal Aspect and Indication Requirements

