T HR SC 10032 ST
Standard
Signalling Design Principle - Circuit
Nomenclature
Version 1.0
Issue date: 03 December 2019
© State of NSW through Transport for NSW 2019
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
Important message
This document is one of a set of standards developed solely and specifically for use on
Transport Assets (as defined in the Asset Standards Authority Charter). It is not suitable for any
other purpose.
The copyright and any other intellectual property in this document will at all times remain the
property 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 providing
products or services to a NSW Government agency and that agency has expressly authorised
you in writing to do so. If this document forms part of a contract with, or is a condition of
approval by a NSW Government agency, use of the document is subject to the terms of the
contract or approval. To be clear, the content of this document is not licensed under any
Creative Commons Licence.
This document may contain third party material. The inclusion of third party material is for
illustrative purposes only and does not represent an endorsement by NSW Government of any
third party product or service.
If you use this document or rely upon it without authorisation under these terms, the State of
New South Wales (including Transport for NSW) and its personnel does not accept any liability
to you or any other person for any loss, damage, costs and expenses that you or anyone else
may suffer or incur from your use and reliance on the content contained in this document. Users
should 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. Standards
may be accessed from the Transport for NSW website at www.transport.nsw.gov.au
For queries regarding this document, please email the ASA at
standards@transport.nsw.gov.au or visit www.transport.nsw.gov.au
© State of NSW through Transport for NSW 2019
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
Standard governance
Owner:
Lead Signals and Control Systems Engineer, Asset Standards Authority
Authoriser:
Chief Engineer, Asset Standards Authority
Approver:
Executive Director, Asset Standards Authority on behalf of the ASA Configuration Control
Board
Document history
Version
Summary of changes
1.0
First issue
© State of NSW through Transport for NSW 2019
Page 3 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
Preface
The 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 the
ASA Charter, the ASA identifies, selects, develops, publishes, maintains and controls a suite of
requirements documents on behalf of TfNSW, the asset owner.
The ASA deploys TfNSW requirements for asset and safety assurance by creating and
managing TfNSW's governance models, documents and processes. To achieve this, the ASA
focuses on four primary tasks:
•
publishing and managing TfNSW's process and requirements documents including TfNSW
plans, 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 engagement
The AEO framework authorises engineering organisations to supply and provide asset related
products and services to TfNSW. It works to assure the safety, quality and fitness for purpose of
those products and services over the asset's whole-of-life. AEOs are expected to demonstrate
how they have applied the requirements of ASA documents, including TfNSW plans, standards
and guides, when delivering assets and related services for TfNSW.
Compliance with ASA requirements by itself is not sufficient to ensure satisfactory outcomes for
NSW Transport Assets. The ASA expects that professional judgement be used by competent
personnel when using ASA requirements to produce those outcomes.
About this document
This standard forms part of the TfNSW suite of railway signalling principles which detail the
requirements and design principles.
This document should be read in conjunction with the suite of TfNSW signalling design principle
standards.
To gain a complete understanding of the suite of signalling design principle standards, refer to
T HR SC 10000 ST Signalling Design Principles - Introduction.
This standard defines the principles associated with the application of circuit nomenclature for
the signalling circuit design requirements on the existing RailCorp network.
This standard supersedes RailCorp document ESG 100.32 Circuit Nomenclature, version 1.0.
The changes to the previous content include the following:
•
replacement of RailCorp organisation roles and processes with those applicable to the
current TfNSW organisational context
© State of NSW through Transport for NSW 2019
Page 4 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
•
conversion of the standard to ASA format and style
Note: This version does not include any technical updates to the requirements. A
review of this document will be conducted in the future to assess the validity of the
technical requirements and to consider enhancements to align with future
technologies and infrastructure projects.
This standard is a first issue.
© State of NSW through Transport for NSW 2019
Page 5 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
Table of contents
1.1.
Introduction ............................................................................................................................................ 7
1.2.
Purpose.................................................................................................................................................. 7
1.3.
References............................................................................................................................................. 7
1.4.
Circuit nomenclature .............................................................................................................................. 7
1.5.
Combination of numerical and alphabetical prefix and terms................................................................ 8
1.6.
Rules for standard naming of repeat and indicating relays ................................................................... 9
1.7.
Nomenclature meaning of letters ........................................................................................................... 9
1.8.
Examples of combinations ................................................................................................................... 10
© State of NSW through Transport for NSW 2019
Page 6 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
1.1.
Introduction
Nomenclature is a system of words used in particular disciplines. It is used in respect of giving
names systematically, following a convention that is used on signalling circuit designs to ensure
that the correct information is always conveyed without ambiguity.
1.2.
Purpose
The purpose of this document is to define the principles associated with the application of circuit
nomenclature for the signalling circuit design requirements on the existing RailCorp network.
1.3.
References
British Standard 376: Part 2:1954
RailTrack Standard GK/RT0205 1995
Route Control System of Interlocking 1982
ST102 Signalling Principles 2 Training Manual
ST401 Route Locking Training Manual
T HR SC 00001 ST Circuit Design Standard – Typical Signalling and Control Systems Circuits
1.4.
Circuit nomenclature
In order to provide a concise, suggestive, graphic code for marking the units on plans, the
following system has been evolved which makes use of designation made up of two parts,
namely:
1. Numerical or alphabetical prefix
The prefix is the number of the individual lever, signal, point, track circuit, and so on and their
associated equipment, entering into the control of, or controlled by, the unit.
Where a letter or letters are used to identify equipment (for example, – track circuits) these
letters shall be placed immediately before the numerical prefix.
Where confusion could arise the control number may be prefixed by the letters indicating the
control point or locality; - SP31, where SP = Sefton Park.
2. Alphabetical term
The alphabetical term consists of one or more letters. Where the letter is used singly or finally it
is used as a noun and designates the general kind of unit. Preceding letters, which are used as
adjectives, denotes the purpose of the unit.
© State of NSW through Transport for NSW 2019
Page 7 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
Where reference is to be made to the position of levers, switches, push buttons or any other
device operated by the signaller, as in the case of a lever lock or a relay representing a lever
position, the letters shall be used in brackets immediately before the final letter.
1.5.
Combination of numerical and alphabetical prefix and
terms
As far as practicable in the list of nomenclatures, assigned letters are suggested, either
because they are the first letter in the words they represent (for example, – A in Approach) or
because of usage. However many letters stand for names which cannot be associated, and are
arbitrary symbols only (for example, – G for Signal). Some of the letters represent several
different meanings of words, depending on their position with respect to numerals and other
letters. The scheme nomenclature shall be used consistently so that there is no mistake in the
meaning.
Where reference is to be made to the position of levers, switches, push buttons or any other
device, the combination of letters shall be used as an adjective, for example, – RWK as in
203RWKR.
To provide for exceptional cases where the nomenclature does not cover the whole of the
conditions, a description may be placed in brackets after the Prefix. For example:
38(S)A HR
Refers to the 38 Shunt A route Caution Relay.
The complete designation of a unit is written as follows:
31DR (without dots or dashes)
(Numerical prefix)
31
(Prefix letter)
(Final letter)
D
R
In the example, “31” is the number of the signal, but when used to refer to the signal will be
'31G'. When the figure is used alone, it will be understood to refer to the lever, switch, push
button or other equipment actuated by the signaller for the control of the signal, thus '31(N)R'
indicates a relay repeating the normal position of the lever, push button and so on.
'31R' indicates a relay associated with Signal 31 and '31DR' indicates a relay controlling the
clear (green) aspect of Signal SP31. In other words, the letter 'R' means relay in general; the
letter 'D' indicates the function of this relay is to control the clear (green) aspect; and the number
'31' definitely indicates the signal which this 'clear' relay controls.
© State of NSW through Transport for NSW 2019
Page 8 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
1.6.
Rules for standard naming of repeat and indicating
relays
When naming track repeat relays, indicating relays and repeat relays of proved functions the
following rules shall apply:
a.
add a ‘P’ when indicating to a remote site
b.
add a number when repeating at the same site
For further explanation and examples refer to T HR SC 00001 ST Circuit Design Standard –
Typical Signalling and Control Systems Circuits.
1.7.
Nomenclature meaning of letters
Table 1 – Legend
Description term (prefix letter)
Apparatus (last letter)
A. Approach; Automatic; Available
A.
B. Block; Bolt; positive of power source
B.
C. Checking or proving; Centre; Control;
Country; Council
C. Contact
Ce. Commence
D. Clear (Distant/green); Data; Direction;
Down
D.
E. Lamp; Light; Earth; Electronic: Emergency
E. Electric apparatus
F. Flashing
f. Fuse
Fn. Finish
G. Signal
G. Signal apparatus, including signals
H. Caution (Home/yellow)
H. Capacitor
HD. Medium (Home/Distant)
I. Intermediate; Isolating
I. Inductor
J. Time Delay; Time Limit; Timer; Timing
J. Rectifier
JP. Turnout (Junction) Repeater
K. Indicating or Detecting; Indicator
K. Indicator (visual)
L. Left; Lever; Lineside; Local; Lock; Locked;
Locking; Low; Lower
L. Lock
M. Machine; Marker; Motor
M. Motor; Module
Mu. Machine in Use
N. Normal; Normalising; negative of power
source
N. Release; hand operated switch, pushbutton or key
O. Off; Operation
O. Resistor
OL. Overlap
© State of NSW through Transport for NSW 2019
Page 9 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
Description term (prefix letter)
Apparatus (last letter)
P. Repeat; Repeating; Pick Up; Plunger;
Power; Preliminary; Proving
P. Lever, latch or trigger contact
Q. Treadle or bar
Q. Local coil of double element relay
R. Red(danger); Remote; Reverse; Right;
R. Relay or Contactor (line or track element of
double element relay); Receiver
S. Section; Shunt; Side; Stick; Supply; Switch;
Sydney
S.
Sn. Suppression
1.8.
Sp. Speed
t. Terminal
T. Track Circuit; Transit
T. Transformer; Transmitter
U. Route; Up; Upper
U. Train description apparatus (for route
indicating); Unit
V. Trainstop
V. Trainstop apparatus
W. Points
W. Point operating apparatus
X. Crossing
X. Audible Indicator (such as bell, buzzer,
horn); AC power supply
Y. Disengaging
Y. Disengaging apparatus
Z. Special, Free
Z. Special unit
Examples of combinations
31(R)R
31 button reverse relay
31(R)PR
31 button reverse repeat relay
31(N)R
31 button normal relay
31YR
31 button disengaging relay
31CeR
31 commence relay
31FnR
31 finish relay
FnPR
Finish repeat relay
FnJR
Finish timing relay
MuR
Machine in use relay
31SR
31 lever stick relay
31LSpR
31 low speed relay
31HR
31 caution (home) relay
31HDR
31 medium (home/distant) relay
31DR
31 clear (distant) relay
© State of NSW through Transport for NSW 2019
Page 10 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
31USR
31 route stick relay
31ALSR
31 approach lock stick relay
31V
31 trainstop
31VNR
31 trainstop normal r relay
31VRR
31 trainstop reverse relay
31VSnR
31 trainstop suppression relay
31ECR
31 lamp checking (proving) relay
31DE
31 green light
31HE
31 yellow light
31RE
31 red light
31ME
31 marker light
31NKE
31 normal indicating (repeater) lamp
31RKE
31 reverse indicating (repeater) lamp
203(N)R
203 lever normal relay
203(R)R
203 lever reverse relay
203(C)R
203 lever centre relay
203NLR
203 normal lock relay
203RLR
203 reverse lock relay
203NWKR 203 normal point detector relay
203RWKR 203 reverse point detector relay
203NWKPR 203 normal point detector repeat relay
203NLKPR 203 normal lock detector repeat relay
203RLKPR 203 reverse lock detector repeat relay
203WZR
203 point free relay
203NWAR 203 normal point available relay
203RWAR 203 reverse point available relay
203NWR
203 normal point contactor
203RWR
203 reverse point contactor
203NOLR
203 normal overlap relay
203ROLR
203 reverse overlap relay
© State of NSW through Transport for NSW 2019
Page 11 of 12
T HR SC 10032 ST
Signalling Design Principle - Circuit Nomenclature
Version 1.0
Issue date: 03 December 2019
203WTJR
203 point transit timer relay
POJR
Power off timer relay
XNR
Crossing control relay
7CTJR
7 “C” track timing relay
© State of NSW through Transport for NSW 2019
Page 12 of 12