Signalling Design Principle - Signals

T HR SC 10001 STStandardSignalling Design Principle SignalsVersion 1.0Issue date: 19 May 2020 State of NSW through Transport for NSW 2020

T HR SC 10001 STSignalling Design Principle - SignalsVersion 1.0Issue date: 19 May 2020Important messageThis document is one of a set of standards developed solely and specifically for use onTransport Assets (as defined in the Asset Standards Authority Charter). It is not suitable for anyother purpose.The copyright and any other intellectual property in this document will at all times remain theproperty of the State of New South Wales (Transport for NSW).You must not use or adapt this document or rely upon it in any way unless you are providingproducts or services to a NSW Government agency and that agency has expressly authorisedyou in writing to do so. If this document forms part of a contract with, or is a condition ofapproval by a NSW Government agency, use of the document is subject to the terms of thecontract or approval. To be clear, the content of this document is not licensed under anyCreative Commons Licence.This document may contain third party material. The inclusion of third party material is forillustrative purposes only and does not represent an endorsement by NSW Government of anythird party product or service.If you use this document or rely upon it without authorisation under these terms, the State ofNew South Wales (including Transport for NSW) and its personnel does not accept any liabilityto you or any other person for any loss, damage, costs and expenses that you or anyone elsemay suffer or incur from your use and reliance on the content contained in this document. Usersshould exercise their own skill and care in the use of the document.This document may not be current and is uncontrolled when printed or downloaded. Standardsmay be accessed from the Transport for NSW website at www.transport.nsw.gov.auFor queries regarding this document, please email the ASA atstandards@transport.nsw.gov.au or visit www.transport.nsw.gov.au State of NSW through Transport for NSW 2020

T HR SC 10001 STSignalling Design Principle - SignalsVersion 1.0Issue date: 19 May 2020Standard governanceOwner:Lead Signals and Control Systems Engineer, Asset Standards AuthorityAuthoriser:Chief Engineer, Asset Standards AuthorityApprover:Executive Director, Asset Standards Authority on behalf of the ASA Configuration ControlBoardDocument historyVersionSummary of changes1.0First issue State of NSW through Transport for NSW 2020Page 3 of 93

T HR SC 10001 STSignalling Design Principle - SignalsVersion 1.0Issue date: 19 May 2020PrefaceThe Asset Standards Authority (ASA) is a key strategic branch of Transport for NSW (TfNSW).As the network design and standards authority for NSW Transport Assets, as specified in theASA Charter, the ASA identifies, selects, develops, publishes, maintains and controls a suite ofrequirements documents on behalf of TfNSW, the asset owner.The ASA deploys TfNSW requirements for asset and safety assurance by creating andmanaging TfNSW's governance models, documents and processes. To achieve this, the ASAfocuses on four primary tasks: publishing and managing TfNSW's process and requirements documents including TfNSWplans, standards, manuals and guides deploying TfNSW's Authorised Engineering Organisation (AEO) framework continuously improving TfNSW’s Asset Management Framework collaborating with the Transport cluster and industry through open engagementThe AEO framework authorises engineering organisations to supply and provide asset relatedproducts and services to TfNSW. It works to assure the safety, quality and fitness for purpose ofthose products and services over the asset's whole-of-life. AEOs are expected to demonstratehow they have applied the requirements of ASA documents, including TfNSW plans, standardsand guides, when delivering assets and related services for TfNSW.Compliance with ASA requirements by itself is not sufficient to ensure satisfactory outcomes forNSW Transport Assets. The ASA expects that professional judgement be used by competentpersonnel when using ASA requirements to produce those outcomes.About this documentThis standard forms part of the TfNSW suite of railway signalling principles which detail therequirements and design principles. This standard specifically covers signals.To gain a complete overview of signalling design requirements, this document should be read inconjunction with the suite of signalling design principle standards.This standard supersedes RailCorp document ESG 100.1 Signals, version 1.15.The changes to previous content include the following: replacement of RailCorp organisation roles and processes with those applicable to thecurrent ASA organisational context minor amendments and clarification to content conversion of the standard to ASA format and style State of NSW through Transport for NSW 2020Page 4 of 93

T HR SC 10001 STSignalling Design Principle - SignalsVersion 1.0Issue date: 19 May 2020Table of contents1.Signals . 61.1.Form of signals . 61.2.Numbering of signals and points and provision of identification plates . 81.3.Designation of class and direction of routes . 181.4.Route indicators and turnout repeaters . 221.5.Form of aspects . 301.6.Application of aspects . 371.7.Signals displaying fixed red aspects . 481.8.Emergency replacement of signals . 501.9.‘A’ Lights . 521.10.Signal profiles . 571.11.Positioning and sighting of signals . 641.12.Positioning of signals reading over power operated points . 741.13.Reading through . 751.14.Intermediate shunt signals . 781.15.Principle withdrawn . 801.16.Signal lamp proving . 801.17.Signal lamp failure . 811.18.Track circuit control of running signal and subsidiary aspects . 831.19.Track circuit control of ground shunting signals . 861.20.Replacement of controlled signals . 861.21.Automatic reclearing of signals . 871.22.Guards indicators . 891.23.Dual controlled signals . 901.24.Data arrangements for turnout repeaters . 92 State of NSW through Transport for NSW 2020Page 5 of 93

T HR SC 10001 STSignalling Design Principle - SignalsVersion 1.0Issue date: 19 May 20201.Signals1.1.Form of signals1.1.1.IntroductionThis design principle addresses the form of signals referenced throughout these principles andwith regard to the descriptions and definitions currently accepted and in use.1.1.2.Running signalsIf a signal controls the movement of trains in the normal direction of traffic over a section of lineat their normal operating speeds (or where bi-directional running is applied, in either direction)then it shall take the form of a running signal and display full size single or double light colourlight aspects to the driver of a train ensuring the best possible visibility.Exceptionally, smaller size aspects may be used in special circumstances or in sections ofunderground railway.Depending on the application a running signal may be controlled or automatic.Depending on its specific purpose a controlled running signal may be further designated anouter home, home, starting or accepting signal.Depending on its mode of operation a distant signal may be either a controlled or an automaticsignal.1.1.3.Subsidiary signalsIf a signal controls the movement of trains over a section of line at specifically restricted speedsand is mounted on the same post, or within the same cage, as a running signal then it shall takethe form of a subsidiary signal beneath the running signal and display a single small size colourlight aspect to the driver of a train in addition to the full size stop aspect.Depending on its specific purpose a subsidiary signal may be further designated a low speed,call on or shunt. The low speed aspect is to be considered a running signal aspect although itmay be time approach cleared and not part of the running aspect sequence. The subsidiary callon signal is utilised for a call on movement on the same route as the running signal when it isnecessary to pass the running signal at stop, for example, when the running signal has failed.The term ’call on’ is no longer preferred and ‘shunt’ shall be used in new work.Shunt ahead indications are no longer used. State of NSW through Transport for NSW 2020Page 6 of 93

T HR SC 10001 STSignalling Design Principle - SignalsVersion 1.0Issue date: 19 May 20201.1.4.Shunting signalIf a signal controls the movement of trains in the normal or opposite direction of traffic over asection of line at restricted speed for shunting or non-running movements only then it shall takethe form of a shunting signal and display small size colour light aspects in either horizontal orvertical form to the driver of a train.The preferred form shall be the horizontal form.Exceptionally, the vertical form shall be used where clearance prevents the installation ofhorizontal form.1.1.5.Co-acting signalA signal provided to co-act with and repeat the indications of an adjacent signal for sightingpurposes.1.1.6.Repeater signalA signal provided to indicate the condition of a running signal in advance with restricted sighting.1.1.7.Shunt repeaterA subsidiary signal provided to indicate the proceed indication of the subsidiary shunting signalnext in advance.1.1.8.Low speed repeaterA subsidiary signal provided to indicate the proceed indication of a low speed subsidiary signalnext in advance.1.1.9.Point indicatorA form of signal (similar to a shunt signal) provided to indicate that a set of points are in positionand locked.1.1.10. Other signalsIf a signal is used for purposes not described under one of the above forms of signal then itshall constitute another form of signal. State of NSW through Transport for NSW 2020Page 7 of 93

T HR SC 10001 STSignalling Design Principle - SignalsVersion 1.0Issue date: 19 May 20201.2.Numbering of signals and points and provision ofidentification plates1.2.1.IntroductionThis design principle addresses the requirements for systematically numbering signals on trackplans, control tables and related documents and drawings, the need to provide prefixes and/orsuffixes to these numbers and the characters to be shown on signal identification plates for thevarious forms of signals in colour light territory.1.2.2.General method of numberingGenerally odd and even numbers shall be used for the down and up directions respectively withlow numbers always commencing at the Sydney end and ascending towards the Country end.Wherever possible the numbering of the signals on each track whether even or odd should becorrelated to ensure that the numbers are systematically sequenced across any adjacent trackand along the track in ascending number order from top to bottom and left to right respectivelywhen Sydney is to the left of the track plan. See Figure 1.Figure 1 – Signal naming layoutIt is expected that some spare numbers will arise from this approach which will be available forany future needs, particularly at the low and high ends of the numbering sequence.1.2.3.PointsAll points are to have a distinctive number not exceeding four digits. For power operated pointsthe number is to be followed by an ‘A’, ‘B’ or ‘C’ either as per the track plan to indicate the endor as follows: AEnd nearest to Sydney BEnd furthest from Sydney (country end) CCatchpoint (only used for triple ended set)For example, 530A for the A end of 530 points, 17 for either single ended power ormechanically operated 17 points. State of NSW through Transport for NSW 2020Page 8 of 93