VRIOGS 012.0.4 RevA - Public Transport Victoria

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24 VRIOGS 012.0.4 Revision A SECTION 9.0 RAILWAY SIGNALLING SYMBOLS All symbols that are permitted to be utilised within the Victorian Railway Network for signalling and communications purposes are contained within the Drawing Management System (DMS) and referenced to within VRIOGS 007.2 Infrastructure Drawing Standards. The DMS also contains “sample circuits” with all allowable symbols and standard circuit drawings. 9.1 General In Railway Signalling, symbols are the characters or signs used on plans & drawings to represent signals and interlocking apparatus, tracks, bridges, buildings and various other parts of the railway infrastructure which may be associated with, or affect the location or operation of railway signals. By the use of symbols all necessary information can be conveyed between the designer and the user of the plans. Symbols to be of use must be clearly understood by the designer and the user who is required to read and to work from plans. To that end this book has been compiled. The symbols for Signal and Circuit Plans and the Circuit Nomenclature and Written Circuits contained herein have been developed from those adopted by the Signal Section of the Association of American Railways, with alterations to suit Victorian conditions and requirements. 9.2 Explanation of Terms The term "signal" within this specification is used to designate that apparatus fixed in a permanent wayside position by means of which the driver of a train is instructed as to the control (speed or routing) of his train. A signal may be mechanically or power operated; and may be manually controlled, or entirely automatic in operation, or have a combination of manual and automatic operation. Two systems of signalling are in use within the Victorian Rail Industry, namely Two Position and Three Position. 9.3 Two Position Signalling In Two Position signalling a separate arm (usually on a separate post) is used to display the distant indication; and also a separate arm is provided for each possible route past that particular signal location towards the next fixed signal location. Two-position signalling is therefore essentially a system of route indications and each arm applies only up to the next signal. 9.4 Three Position Signalling In Three Position signalling one arm or light unit may give both the home and the distant indications, and a combination of two arms on the one post may apply to any number of possible routes past that location. NOTE: This document is controlled only when viewed on the DOT Engineering Standards website. Any other copy of this document is uncontrolled, and the content may be inaccurate.
VRIOGS 012.0.4 Revision A 25 Three position signalling is therefore a system giving indications for speed control of trains and does not necessarily indicate the route to which the signal aspect applies. 9.5 Automatic Signal An automatic signal is one, the primary control of which is the track circuit, or more precisely it is a signal which is controlled by the passage of trains and automatically gives an indication of the condition - occupied or clear - of the section or sections in its control. 9.6 Non-Automatic Signal A non-automatic signal is in no way controlled by a track circuit. 9.7 Semi-Automatic Signal A semi-automatic signal is an automatic signal which in addition is manually controlled. This manual control is direct, and a signal is not to be considered semi-automatic because some feature of its control is dependent upon the operation of another signal which is manually controlled. The manual control of a semi-automatic signal may be by a lever of an interlocking machine or by a non-interlocked lever such as that operated by a level crossing gatekeeper. Semi-automatic or manually controlled automatic signals are divided into three groups namely - Stick, Semi-stick, or Non-stick signals. 9.7.1 Stick A “Stick, semi-automatic” signal is a signal which will not automatically assume the warning or the clear aspect after it has been put to stop by the interruption of the track circuit, until its manually operated control has been restored to the normal and reversed again. 9.7.2 Semi-stick A “Semi-stick, semi-automatic” signal is a signal which will not automatically assume the warning or the clear aspect after it has been put to stop by the interruption of the track circuit, until a manually operated control, other than its own direct control, has been restored to the normal position. This other manual control will usually be the control lever of the signal in advance. 9.7.3 Non-stick A “Non-stick, semi-automatic” signal is a signal which will operate automatically as long as all contacts (including manually controlled contacts) other than track relay contacts, affecting its control, are closed. NOTE: This document is controlled only when viewed on the DOT Engineering Standards website. Any other copy of this document is uncontrolled, and the content may be inaccurate.
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VRIOGS 012.0.4 RevA - Public Transport Victoria

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