GLOSSARY OF SIGNALLING TERMS

Railway Signalling Glossary of Signalling Terms 

Indian Railway Signalling Network Rail Railway Signalling - Glossary of Signalling Terms 

Railway Signalling – Glossary of Signalling Terms 

This standard defined the meaning of commonly used signaling terms to ensure that each term is clearly understood and always use to convey the same meaning. The glossary is arranged in alphabetic order.

Examples:       

  TERM        DEFINITION
ALPHANUMERIC  ROUTE INDICATOR A ROUTE INDICATOR that conveys its  information by alphanumeric characters.
APPROACH LIGHTING The lighting of a SIGNAL only on the approach of a train.
ATP Abbreviated term for AUTOMATIC TRAIN PROTECTION.
BANNER REAPEATING SIGNAL A SIGNAL that provides the driver with preliminary information about whether a SIGNAL is ON or OFF.
CD Abbreviated term for CLOSE DOORS INDICATOR.
FLASHING DOUBLE YELLOW (ASPECT) Displayed by a COLOUR LIGHT SIGNAL, informs the driver to expect the next MAIN SIGNAL at FLASHING SINGLE YELLOW.
HEADWAY The shortest distance or time interval between Two following trains, so that the second train can run at its normal operating speed without being restricted by the SIGNAL ASPECTS.
LAST WHEEL REPLACEMENT A control applied to a SIGNAL which replaces it
to its most restrictive aspect only after the whole
train has passed the signal.
LOS Abbreviated term for LIMIT OF SHUNT   INDICATOR.
NX Abbreviated term for ENTRANCE – EXIT SYSTEM.
SPAD SIGNAL passed at DANGER.
SUPPRESSION (AWS)  Inhibition of the operation of AWS track equipment for movements to which it does not   apply.
TORR Abbreviated term for TRAIN OPERATED ROUTE RELEASE.
WARNING (ROUTE CLASS) A ROUTE from one MAIN SIGNAL to the next main signal where the full OVERLAP is not available or not required

 

IDENTIFICATION OF SIGNALLING AND RELATED EQUIPMENT

 

To define the principles for ensuring that items of signalling and related equipment are clearly and unambiguously identified.

OBJECTIVES

The objective of identifying signalling and related equipment is to ensure that

* Confusion does not arise in verbal or written communication   when geographical location and equipment are the subject   of communication.

* Events, incidents and operational engineering activities can   be accurately and concisely described.

RESPONSIBILITIES            

Network Rail, as infrastructure controller, shall ensure that a procedure is in place that ensures that allocated identities are documented.

 PLACE NAMES

Geographic Identity Each of the following features shall have a name.

* Control Centre, Signal Box or Gate Box

* Ground Frame or Ground Switch Panel.

* Tunnel, Viaduct, Swing bridge etc.

LINES & SIDINGS

Each line and siding within or adjoining a signaled area, shall have an identity.

 

IDENTIFICATION

Each signal box or locality shall be assigned a code which is unique as far is reasonably practicable.

 

BLOCK SYSTEM

Manually controlled block system shall be named by appropriate reference to the line and/or the ends of the block section (e.g. AA-BB DM Block).

 

TRAIN DETECTION

Each track section shall have an identity. The identity shall generally be unique to the signal box or locality as applicable. Train detection equipment associated with track section shall be identified by the track section identity and where necessary suitable suffixes.

 

LINESIDE SIGNALS

Each signal shall have an identity that is unique to the signal box or locality as applicable. Signals worked by levers shall be identified by the lever number. The following signal suffixes shall be used and the meanings are exclusive.

* BR for a banner repeating signal, the number being as for the   repeated signal.

* CA for a co-acting signal, the number being as for the primary   signal.

* R only for a distant signal worked from the same lever as a   stop signal, the number being the lever number.

 

SIGNAL IDENTIFICATION PLATES

Identification plates shall be provided as the following signals:

* Colour light signals

* Semaphore running signals.

* Position light shunt and limit of shunt signals.

* Banner repeater signals.

Identification plates are not generally required at other types of signal or board but the provision of adequate identification plates or label shall be considered.

 

OPERABLE LINESIDE INDICATORS          

Each operable indicator not forming part of a signal shall have an individual identity. Loading / unloading indicators shall be identified in the same manner as signals. Other types of operable indicator shall be identified by association with the relevant function namely:

* RA indicator(s) with signal, or with platform where there is   no relevant signal.

* OFF indicator(s) with signal

* SPAD indicator with signal(s)

* Points indicators with points.

 

POINTS

Each point end (as defined and including catch points and hand points) worked or detected by a signalling function, shall have an identity that is unique to the signal box or locality as applicable. Points worked by levers shall be identified by the lever number.

 

LOCKOUT SYSTEMS

Each lockout section shall have a numeric identity unique to the signal box.

STAFF WARNING SYSTEMS

Each staff warning system shall have a place name and associated locality code.

TRACK – BASED DATA TRANSMISSION EQUIPMENT 

All balises, loops and other track equipment used for data transmission between track and trains shall be uniquely idetified.

 

TRAIN – BASED SIGNALLING AND DATA TRANSMISSION  EQUIPMENT

Where it is necessary for the operation of the signalling system for train-mounted equipment to report the identity of the train or vehicle on which it is installed, the infrastructure controller shall consult with the train operators to determine the system of identification to be used and shall establish and maintain a system for the allocation and recording these identities.

 

Railway Signalling – Glossary of Signalling Terms, IDENTIFICATION OF SIGNALLING AND RELATED EQUIPMENT, OBJECTIVES,RESPONSIBILITIES , PLACE NAMES, LINES & SIDINGS, IDENTIFICATION,BLOCK SYSTEM,TRAIN DETECTION,SIGNAL IDENTIFICATION PLATES,OPERABLE LINESIDE INDICATORS ,POINTS, LOCKOUT ,STAFF WARNING SYSTEMS,TRACK

1 thought on “Railway Signalling Glossary of Signalling Terms 

  1. Howdy I am so grateful I found your site, I really found you by accident,
    while I was searching on Aol for something else, Anyhow I am
    here now and would just like to say many thanks for
    a tremendous post and a all round interesting blog (I also love the theme/design), I
    don’t have time to read it all at the minute but I have bookmarked it and
    also added your RSS feeds, so when I have time I will be back to read
    more, Please do keep up the fantastic jo.

Leave a Reply

Your email address will not be published. Required fields are marked *