glossary of railway terminology...semi-automatic colour light signal that can be operated by a key...
TRANSCRIPT
Glossary of RailwayTerminology
Issue 4
Glos
sary
of Ra
ilway
Term
inolog
y
December 2017
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Published by:RSSBThe authoritative version of this document is available atwww.rssb.co.uk
Contents approved by Traffic Operations and ManagementStandards Committee.
Enquiries on this document can be forwarded to:[email protected]
Issue 402 December 2017
© Copyright 2017Rail Safety and Standards Board Limited
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
IntroductionTo meet the requirements of the European Rail Agency, theglossary is now presented by two methods - by subject matter andby alphabetical listing.
Terms by subject matter Page 2 to 16Terms in alphabeticalorder
Page 17 to 30
Conventions used in thisGlossary
Example
A black line in the margin indicates achange to that term and is shownwhen published in the glossary forthe first time
12/17 1
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Electrified LinesConductor rail A rail through which electricity is supplied to
electric-powered trains.
Earthed The term ‘earthed’ when applied to theoverhead line equipment which is normallylive, means connected to the traction returnrunning rail either directly or to a structurewhich is itself connected thereto.
Electrified line A line that is electrified either by 25,000 voltsAC overhead lines or by 750 volts DCconductor rails. Local instructions are issuedfor certain sections of route electrified by1500 volts DC overhead lines.
Isolated Electrical equipment is isolated when it isdisconnected from all sources of electricitysupply in a secure way.
Isolation Isolation is the action of causing electricalsections or sub-sections of the OLE or CREto be isolated. For AC it includes the entireprocess of switching off, securing, testing andearthing and issue of the overhead linepermit. For DC it includes the entire processof switching off, securing and testing andissue of the conductor rail permit.
Live Connected to an electrical supply.
Overhead lineequipment
Wires and associated equipment, suspendedover or adjacent to the railway line forsupplying electricity to electric trains.
Switched off Electrical equipment that is disconnected andseparated from all sources of supply.
Terms by subject matter
2 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Engineering WorkAffect thenormal passageof trains
Any activity or event that allows train workingto continue but causes diversion, inability tocall at a planned destination or introduction ofdegraded-mode operations such as passingsignals at danger, handsignalling, manualroute setting or single line workingarrangements.
Affect thesafety of trainworking
Any activity or event that may, during itscourse, render a movement control orinterlocking system unusable for the signalingof trains.
Engineeringtrain
Includes an on-track machine.
EngineeringPossessionReminder (EPR)
A reminder applied by the signaller to one ormore axle counter sections in advance ofpre-planned engineering works in order toindicate the area affected. When removedfrom an axle counter section indicatingoccupied, this initiates an unconditional reset/restoration of the axle counter without aspectrestriction.
Intermediatepoint to apossession
A location other then the limits at the ends ofthe possession where an engineering traincan enter or leave the possession to:• an open line• a siding not under possession.
On-track plant A road-rail vehicle (RRV) or rail mountedmaintenance machine (RMMM) also knownas ‘in possession only’ vehicles.
PossessionLimit Board(PLB)
A double-sided board, red on both sides, witha red light (which may be steady or flashing).The board also has the word STOP printedon both sides.
12/17 3
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Track circuitoperatingdevice (T-COD)
A special device that can be placed on theline to provide protection by operating thetrack circuit, to hold a signal at danger.
Incidents & EmergenciesControlledevacuation
The evacuation of passengers from a trainafter the signaller has confirmed that all lineshave been protected.
Detonator A small disc-shaped warning device,designed to be placed on the railhead forprotection and emergency purposes. Itexplodes when a train passes over it.
DetonatorProtection
Detonator protection consists of threedetonators placed 20 metres (approx 20yards) apart on the same rail with apossession limit board at the first detonator inthe direction of travel.
Emergencyevacuation
The evacuation of passengers from a train ifthe signaller states that protection cannot begiven or the signaller cannot be contacted.
Emergencyprotection
The means of protecting a train by trackcircuit operating clips, hand danger signalsand detonators when:• a driver or guard cannot contact the
signaller, or• the signaller cannot provide signal
protection.
Protection Ways of making sure that a line is protected.This includes keeping signals at danger,placing detonators on the line, using a trackcircuit operating clip and showing a handdanger signal.
Track circuitoperating clip
A device which, in an emergency can beplaced on top of each running rail to operatethe track circuit and protect an obstruction.
Terms by subject matter
4 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Uncontrolledevacuation
The self evacuation of passengers from atrain, which is not initiated by the driver orguard.
Level crossingsAutomatic levelcrossing
Any of the following level crossings:• Automatic half-barrier (AHBC)• Automatic barrier crossing, locally
monitored (ABCL)• Automatic open crossing, locally
monitored (AOCL)• Crossing with red and green warning
lights (R/G).
Barrowcrossing
A crossing (often at the end of a platform) forrailway personnel to use. Some barrowcrossings have white-light indicators which,when lit, indicate to the user that it is safe tocross.
Controlledcrossing
Any of the following level crossings.• Manned crossing with barriers (MCB).• Manned crossing with gates (MG).• Remotely controlled crossing with barriers
(RC).• Barrier crossing with closed-circuit
television (CCTV).• Barrier crossing with obstacle detection
(OD).
Level crossing Any manned, automatic, controlled, or opencrossing shown in Table A of the SectionalAppendix.
Manned levelcrossing
A level crossing that is operated locally by asignaller or crossing keeper (MCB or LC).
12/17 5
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Open levelcrossing
An unmanned level crossing that has nobarriers, gates or road traffic signals. It has a‘Give Way’ sign on each road approach.
Lines, Stations and DepotsAdjacent line A line or siding next to the line you are on.
Bi-directionalline
A line on which the signalling allows trains torun in both directions.
Goods line A line that has not been signalled to thestandard required for running passengertrains.
Maintenancedepot
A location defined in a train operator’sContingency Plan with the facilities to repairor replace specified items of defectiveon-train equipment.
No-block line A line on which the signaller does not monitorthe condition of the block section.
Running line A line as shown in Table A of the SectionalAppendix as a passenger line or as anon-passenger line.
Siding A line on which vehicles are marshalled,stabled, loaded, unloaded or serviced clear ofa running line.
Single line One line is available for movements in bothdirections.
Station Terminal, depot, yard or halt.
Lineside EquipmentAspect The indication of a colour light signal that the
driver sees.
Terms by subject matter
6 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
ATWS Automatic track warning system.An individual or lineside warning system thatcan be installed at a site of work to:• detect an approaching train• alert personnel who are on or near the
line.It may be installed temporarily for the periodof work or it may be installed permanently ata location. This definition does not includeTOWS or LOWS
AutomaticSignal
A signal operated by the passage of trains.The signaller or a person operating a signalpost replacement switch can place someautomatic signals to danger.
Axle counter A method of detecting the presence of a trainor vehicle on a line. Track-mountedequipment, at each end of a portion of line,counts the number of axles passing over.This is used to identify when a portion of lineis occupied or clear.
Axle counterhead
A device that detects the passage of a wheelpassing over a running rail.
Block marker Reflective board that serves as a physicalindication of signalling sections withinERTMS. Used when degraded working isrequired.
Home signal The first stop signal on the approach to asignal box on a line not signalled by the trackcircuit block system of signalling.
Interlocking A general term applied to equipment thatcontrols setting and releasing signals andpoints to prevent an unsafe condition of thesignalling system arising during the passageof trains.
12/17 7
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Intermediateblock homesignal
A stop signal that controls the exit from anintermediate block section. (Although anintermediate block home signal controls theentrance to an absolute block section, it isreferred to as the intermediate block homesignal).
Junction signal A signal that controls more than one runningroute and can display an indication of route.
LOWS Lookout operated warning system. A linesidewarning system, used to warn personnel onor near the line about an approaching train. Itis operated by a lookout.
Main aspect The following aspects of a colour light signal:• red• yellow• two yellows• flashing yellow• two flashing yellows• green.
PoSA Proceed-on-sight authority. A signal used forcontrolling movements into a section affectedby a failure of signalling equipment.
Right-sidefailure
A failure that does not reduce the protectiongiven by signalling equipment.
Section signal A stop signal that controls the entrance to ablock section or intermediate block sectionahead.
Semi-automaticsignal
A signal normally operated by the passage oftrains, but can also be controlled from thesignal box or from a ground frame, or by aperson operating a signal post replacementswitch.
Terms by subject matter
8 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Shunt entryboard
A lineside indicator board that indicates theentry of a shunt route on ERTMS cabsignalled lines where lineside signals are notprovided.
Shunting signal A signal that is provided for shuntingpurposes only.
Signal postreplacementkey
The key used to operate a signal postreplacement switch.
Signal postreplacementswitch
A switch on the post of an automatic orsemi-automatic colour light signal that can beoperated by a key to turn it to, and keep it at,danger.
Stop signal A signal that can show a stop aspect orindication.
Subsidiarysignal
A semaphore signal used for controllingshunting movements and movements ontooccupied tracks. It is always positioned belowthe main semaphore arm with which it isassociated.
TOWS Train operated warning system. An audiblewarning system at locations listed in theSectional Appendix. When switched on, it isused to warn personnel on or near the lineabout an approaching train.
TPWS Train protection and warning system. Asystem by which a train is stopped by anautomatic application of the brakes whenactivated by lineside equipment.
Wrong-sidefailure
A failure that reduces or removes theprotection given by signalling equipment.
12/17 9
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
PointsCatch points Points designed to derail vehicles running
back on a gradient in the wrong direction.These points may be unworked if trainsnormally pass over them in one directiononly.
Derailer A device at an exit from a siding or bayplatform that derails an unauthorisedmovement.
Detection An electrical or mechanical indication thatpoints are set in the correct position.
Facing pointlock
Equipment that physically locks facing pointsso that they cannot move.
Facing points Points where two routes diverge.
Ground frame A control point containing levers or switchesto allow points in running lines and sidings,and any associated signals, to be operatedlocally. This local operation is only possiblewhen the signaller at the controlling signalbox gives a release. Also includes aground-switch panel.
Hand points Points that are worked manually by leverindependent of any other signalling controls.
Mechanicalpoints
Points that are mechanically operated withoutany other form of power operation.
Power-operatedpoints
Points that are operated by means other thanmechanically.
Run through (ofpoints)
An incident where a movement runs througha trailing set of points that are not set in thecorrect position for the movement.
Token Any single line token, staff or tablet.
Terms by subject matter
10 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Track circuit A method of detecting the presence of a trainor vehicle on a line. An electrical device,using the rails as an electrical circuit, detectsthe absence of a train or vehicle. If theserules refer to track circuits, this also includesdetection by axle counters unless speciallyexcluded.
Trailing points Points where two routes converge.
Train-operatedpoints
Points that are continuously driven to oneposition such that facing movements alwayspass through them in the same direction.Trains themselves operate the points in thetrailing reverse direction.
Trap points Facing points at an exit from a siding orconverging route that derail an unauthorisedmovement, so protecting the adjacent line.
Unworkedpoints
Points that are not operated from a signal boxor ground frame.
Worked points Points that are operated from a signal box orground frame.
Train Signalling RegulationsAbsolute block A signalling system that allows only one train
to be in a block section at the same time. Theblock indicator is used to indicate whether theline between adjacent signal boxes is clear oroccupied.
Block section The section of the line between the sectionsignal of one signal box and the home signalof the next signal box ahead.
ERTMS European rail traffic management system. Asignalling system that uses in cab indicationsas opposed to external track bourne signals.
12/17 11
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Intermediateblock section
The line between the section signal and theintermediate block home signal worked by thesame signal box in the same direction oftravel.
Overlap The distance beyond a stop signal up towhich the line must be clear before theprevious signal can show a proceed aspect.
Route settingposition
Location on a signalling control panel orworkstation from which a route can be set orclosed.
Station limits The line between the home signal and thesection signal worked by the same signal boxand in the same direction of travel. This doesnot apply on a track circuit block line.
Track circuitblock
A method of signalling trains in a section ofline using track circuits or other means ofautomatic train absence detection andwithout using block instruments.
Train signallingregulations
Instructions for use by the signaller that givedetails of the rules, regulations andinstructions relating to each different kind ofsignalling system.
Transition The process of the onboard ERTMS signalingsystem transferring from one signallingsystem to another. This process has to beacknowledged by the driver.
Train WorkingBrakingdistance
The distance a train needs in which to stop orreduce speed, from travelling at a givenspeed.
Coupled inmultiple
Traction units coupled to allow throughcontrols by one driver.
Coupled intandem
Each traction unit is separately controlled byits own driver, with through control of theautomatic brake only.
Terms by subject matter
12 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Driver only (orDO) train
A train that is worked only by a driver anddoes not have a guard.
In service A train is in service from the time it starts itsjourney until the time it completes its journey.A vehicle is in service when it forms part of atrain which is in service.
End of authority The location to which a train is permitted toproceed. The boundary of a movementauthority.
Full supervision The normal movement used by ERTMS, anauthority that gives comprehensive protectionto all trains.
Journey The route between the depot, siding, platformline or other authorised place where the trainenters service and the depot, siding, platformline or other authorised place where the trainreaches its destination, or:• is required to reverse before continuing to
its destination• is required to have vehicles attached or
detached• is required to terminate short of its
destination, as a result of• infrastructure fault• line blockage• defective on-train equipment• any other operational reason.
This also applies to short-distance shuntingmovements.
Movementauthority
Permission for a train to run to a specificlocation as a signalled move.
12/17 13
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
On sight A type of movement authority used byERTMS that allows entry into an occupiedsection. The driver will be presented with amaximum speed and must ensure that thetrain is stopped short of any obstruction.
One-trainworking
Method of signalling on a single line, with orwithout a train staff, where only one train at atime is permitted.
Out of service A train is out of service between the time thatit completes its journey and the time it isready to start another journey.
Out of service A vehicle is out of service when it forms partof a train that is out of service, or when it hasbeen detached from a train in a depot, siding,platform line or other authorised place. Thedetraining of passengers does not in itselfmean a train has been taken out of service.
Passengerservice
A train that is in service carrying passengers.
Permissiblespeed
The maximum permitted speed as shown inthe Sectional Appendix.
Shuntingmovement
Any movement of a train or vehicle other thana train passing normally along a running line.
Tail lamp Includes an illuminated built-in red light orblind.
TrainsBrake van Any vehicle with a brake compartment.
Cant rail The point on the side of a locomotive orcoach where the bodyside meets the roof(sometimes marked by an orange stripe).
Central door-locking
A secondary locking system fitted to certainslam-door passenger vehicles and controlledby the guard that prevents passengers fromopening the doors.
Terms by subject matter
14 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Defective on-train equipment
On-train equipment that:• is not performing its intended
safetyfunction, either fully or partly• is isolated• is missing.
Driver machineinterface (DMI)
The device used by a driver to interact withERTMS onboard equipment. Typically acomputer screen located in the driving cab.
Driver’sreminderappliance (DRA)
A device in a driving cab that allows the driverto set a reminder that the signal ahead is atdanger. While the DRA is set, the drivercannot take power.
Power-operateddoors
Doors on a train where the opening andclosing are controlled by the driver or guard.
TASS Tilt authorisation and speed supervision. Asystem on tilting trains that controls:• the operation of the tilt system• the speed of the train on routes where
enhanced permissible speeds apply onTASS fitted lines.
TPWS Train protection and warning system. Asystem by which a train is stopped by anautomatic application of the brakes whenactivated by lineside equipment.
Track circuitactuator
Equipment provided on certain trains toimprove the operation of track circuits.
Traction unit Locomotive, multiple unit, self-propelled railvehicle or road-rail vehicle operating in railmode.
Train This includes light locomotive, self-propelledrail vehicle or road-rail vehicle in rail mode.
12/17 15
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
WorkforceCompetentperson
A person who is passed as being qualifiedand has the required knowledge and skills tocarry out a particular rule, regulation,instruction or procedure.
Operationscontrol
The term used for Network Rail OperationsControl Offices.
Pilotman A person who has been appointed to managethe passage of trains over a single line duringa failure of equipment, during repairs or dueto an obstruction.
Rolling stocktechnician
A person who is authorised and has thenecessary technical competence to examineor repair specified items of equipment formingpart of a train or vehicle.
Traincrew Driver and guard.
Train operator The company responsible for operating atrain.
Your employer The company, or subsidiary of a largerorganisation for whom you work.
Terms by subject matter
16 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
AAbsolute block A signalling system that allows only one train
to be in a block section at the same time. Theblock indicator is used to indicate whether theline between adjacent signal boxes is clear oroccupied.
Adjacent line A line or siding next to the line you are on.
Affect thenormal passageof trains
Any activity or event that allows train workingto continue but causes diversion, inability tocall at a planned destination or introduction ofdegraded-mode operations such as passingsignals at danger, handsignalling, manualroute setting or single line workingarrangements.
Affect thesafety of theline
Any activity or event that may, during itscourse, render the track, the formation or astructure unsafe for the passage of trains, orunsafe for the passage of trains at normalspeed.
Affect thesafety of trainworking
Any activity or event that may, during itscourse, render a movement control orinterlocking system unusable for the signalingof trains.
Aspect The indication of a colour light signal that thedriver sees.
12/17 17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
ATWS Automatic track warning system.An individual or lineside warning system thatcan be installed at a site of work to:• detect an approaching train• alert personnel who are on or near the
line.It may be installed temporarily for the periodof work or it may be installed permanently ata location. This definition does not includeTOWS or LOWS
Automatic levelcrossing
Any of the following level crossings:• Automatic half-barrier (AHBC)• Automatic barrier crossing, locally
monitored (ABCL)• Automatic open crossing, locally
monitored (AOCL)• Crossing with red and green warning
lights (R/G).
AutomaticSignal
A signal operated by the passage of trains.The signaller or a person operating a signalpost replacement switch can place someautomatic signals to danger.
Axle counter A method of detecting the presence of a trainor vehicle on a line. Track-mountedequipment, at each end of a portion of line,counts the number of axles passing over.This is used to identify when a portion of lineis occupied or clear.
Axle counterhead
A device that detects the passage of a wheelpassing over a running rail.
Terms by alphabetical order
18 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
BBarrowcrossing
A crossing (often at the end of a platform) forrailway personnel to use. Some barrowcrossings have white-light indicators which,when lit, indicate to the user that it is safe tocross.
Bi-directionalline
A line on which the signalling allows trains torun in both directions.
Block marker Reflective board that serves as a physicalindication of signalling sections withinERTMS. Used when degraded working isrequired.
Block section The section of the line between the sectionsignal of one signal box and the home signalof the next signal box ahead.
Brake van Any vehicle with a brake compartment.
Brakingdistance
The distance a train needs in which to stop orreduce speed, from travelling at a givenspeed.
CCatch points Points designed to derail vehicles running
back on a gradient in the wrong direction.These points may be unworked if trainsnormally pass over them in one directiononly.
Cant rail The point on the side of a locomotive orcoach where the bodyside meets the roof(sometimes marked by an orange stripe).
Central door-locking
A secondary locking system fitted to certainslam-door passenger vehicles and controlledby the guard that prevents passengers fromopening the doors.
12/17 19
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Competentperson
A person who is passed as being qualifiedand has the required knowledge and skills tocarry out a particular rule, regulation,instruction or procedure.
Conductor rail A rail through which electricity is supplied toelectric-powered trains.
Controlledcrossing
Any of the following level crossings.• Manned crossing with barriers (MCB).• Manned crossing with gates (MG).• Remotely controlled crossing with barriers
(RC).• Barrier crossing with closed-circuit
television (CCTV).• Barrier crossing with obstacle detection
(OD).
Controlledevacuation
The evacuation of passengers from a trainafter the signaller has confirmed that all lineshave been protected.
Coupled inmultiple
Traction units coupled to allow throughcontrols by one driver.
Coupled intandem
Each traction unit is separately controlled byits own driver, with through control of theautomatic brake only.
DDefective on-train equipment
On-train equipment that:• is not performing its intended
safetyfunction, either fully or partly• is isolated• is missing.
Derailer A device at an exit from a siding or bayplatform that derails an unauthorisedmovement.
Terms by alphabetical order
20 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Detection An electrical or mechanical indication thatpoints are set in the correct position.
Detonator A small disc-shaped warning device,designed to be placed on the railhead forprotection and emergency purposes. Itexplodes when a train passes over it.
DetonatorProtection
Detonator protection consists of threedetonators placed 20 metres (approx 20yards) apart on the same rail with apossession limit board at the first detonator inthe direction of travel.
Driver only (orDO) train
A train that is worked only by a driver anddoes not have a guard.
Driver machineinterface (DMI)
The device used by a driver to interact withERTMS onboard equipment. Typically acomputer screen located in the driving cab.
Driver’sreminderappliance (DRA)
A device in a driving cab that allows the driverto set a reminder that the signal ahead is atdanger. While the DRA is set, the drivercannot take power.
EEarthed The term ‘earthed’ when applied to the
overhead line equipment which is normallylive, means connected to the traction returnrunning rail either directly or to a structurewhich is itself connected thereto.
Electrified line A line that is electrified either by 25,000 voltsAC overhead lines or by 750 volts DCconductor rails. Local instructions are issuedfor certain sections of route electrified by1500 volts DC overhead lines.
Emergencyevacuation
The evacuation of passengers from a train ifthe signaller states that protection cannot begiven or the signaller cannot be contacted.
12/17 21
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Emergencyprotection
The means of protecting a train by trackcircuit operating clips, hand danger signalsand detonators when:• a driver or guard cannot contact the
signaller, or• the signaller cannot provide signal
protection.
End of authority The location to which a train is permitted toproceed. The boundary of a movementauthority.
EngineeringPossessionReminder (EPR)
A reminder applied by the signaller to one ormore axle counter sections in advance ofpre-planned engineering works in order toindicate the area affected. When removedfrom an axle counter section indicatingoccupied, this initiates an unconditional reset/restoration of the axle counter without aspectrestriction.
Engineeringtrain
Includes an on-track machine.
ERTMS European rail traffic management system. Asignalling system that uses in cab indicationsas opposed to external track bourne signals.
FFacing pointlock
Equipment that physically locks facing pointsso that they cannot move.
Facing points Points where two routes diverge.
Full supervision The normal movement used by ERTMS, anauthority that gives comprehensive protectionto all trains.
Terms by alphabetical order
22 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
GGoods line A line that has not been signalled to the
standard required for running passengertrains.
Ground frame A control point containing levers or switchesto allow points in running lines and sidings,and any associated signals, to be operatedlocally. This local operation is only possiblewhen the signaller at the controlling signalbox gives a release. Also includes aground-switch panel.
HHand points Points that are worked manually by lever
independent of any other signalling controls.
Home signal The first stop signal on the approach to asignal box on a line not signalled by the trackcircuit block system of signalling.
IIn service A train is in service from the time it starts its
journey until the time it completes its journey.A vehicle is in service when it forms part of atrain which is in service.
Interlocking A general term applied to equipment thatcontrols setting and releasing signals andpoints to prevent an unsafe condition of thesignalling system arising during the passageof trains.
Intermediateblock homesignal
A stop signal that controls the exit from anintermediate block section. (Although anintermediate block home signal controls theentrance to an absolute block section, it isreferred to as the intermediate block homesignal).
12/17 23
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Intermediateblock section
The line between the section signal and theintermediate block home signal worked by thesame signal box in the same direction oftravel.
Intermediatepoint to apossession
A location other then the limits at the ends ofthe possession where an engineering traincan enter or leave the possession to:• an open line• a siding not under possession.
Isolated Electrical equipment is isolated when it isdisconnected from all sources of electricitysupply in a secure way.
Isolation Isolation is the action of causing electricalsections or sub-sections of the OLE or CREto be isolated. For AC it includes the entireprocess of switching off, securing, testing andearthing and issue of the overhead linepermit. For DC it includes the entire processof switching off, securing and testing andissue of the conductor rail permit.
Terms by alphabetical order
24 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
JJourney The route between the depot, siding, platform
line or other authorised place where the trainenters service and the depot, siding, platformline or other authorised place where the trainreaches its destination, or:• is required to reverse before continuing to
its destination• is required to have vehicles attached or
detached• is required to terminate short of its
destination, as a result of• infrastructure fault• line blockage• defective on-train equipment• any other operational reason.
This also applies to short-distance shuntingmovements.
Junction signal A signal that controls more than one runningroute and can display an indication of route.
LLevel crossing Any manned, automatic, controlled, or open
crossing shown in Table A of the SectionalAppendix.
Lever Includes a switch, button or workstationcontrol.
Live Connected to an electrical supply.
LOWS Lookout operated warning system. A linesidewarning system, used to warn personnel onor near the line about an approaching train. Itis operated by a lookout.
12/17 25
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
MMain aspect The following aspects of a colour light signal:
• red• yellow• two yellows• flashing yellow• two flashing yellows• green.
Maintenancedepot
A location defined in a train operator’sContingency Plan with the facilities to repairor replace specified items of defectiveon-train equipment.
Manned levelcrossing
A level crossing that is operated locally by asignaller or crossing keeper (MCB or LC).
Mechanicalpoints
Points that are mechanically operated withoutany other form of power operation.
Movementauthority
Permission for a train to run to a specificlocation as a signalled move.
NNo-block line A line on which the signaller does not monitor
the condition of the block section.
OOn sight A type of movement authority used by
ERTMS that allows entry into an occupiedsection. The driver will be presented with amaximum speed and must ensure that thetrain is stopped short of any obstruction.
One-trainworking
Method of signalling on a single line, with orwithout a train staff, where only one train at atime is permitted.
Terms by alphabetical order
26 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
On-track plant A road-rail vehicle (RRV) or rail mountedmaintenance machine (RMMM) also knownas ‘in possession only’ vehicles.
Open levelcrossing
An unmanned level crossing that has nobarriers, gates or road traffic signals. It has a‘Give Way’ sign on each road approach.
Operationscontrol
The term used for Network Rail OperationsControl Offices.
Out of service A train is out of service between the time thatit completes its journey and the time it isready to start another journey.
Out of service A vehicle is out of service when it forms partof a train that is out of service, or when it hasbeen detached from a train in a depot, siding,platform line or other authorised place. Thedetraining of passengers does not in itselfmean a train has been taken out of service.
Overhead lineequipment
Wires and associated equipment, suspendedover or adjacent to the railway line forsupplying electricity to electric trains.
Overlap The distance beyond a stop signal up towhich the line must be clear before theprevious signal can show a proceed aspect.
PPassengerservice
A train that is in service carrying passengers.
Permissiblespeed
The maximum permitted speed as shown inthe Sectional Appendix.
Pilotman A person who has been appointed to managethe passage of trains over a single line duringa failure of equipment, during repairs or dueto an obstruction.
12/17 27
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
PoSA Proceed-on-sight authority. A signal used forcontrolling movements into a section affectedby a failure of signalling equipment.
PossessionLimit Board(PLB)
A double-sided board, red on both sides, witha red light (which may be steady or flashing).The board also has the word STOP printedon both sides.
Power-operateddoors
Doors on a train where the opening andclosing are controlled by the driver or guard.
Power-operatedpoints
Points that are operated by means other thanmechanically.
Protection Ways of making sure that a line is protected.This includes keeping signals at danger,placing detonators on the line, using a trackcircuit operating clip and showing a handdanger signal.
RReminderappliance
A device or control used to remind thesignaller that a particular lever, button orswitch must not be operated at all, or usedonly under certain conditions.
Repeater (in asignal box)
A dial or indicator in a manual signal box thatshows the position of a signal arm andwhether the signal lamp is lit.
Right-sidefailure
A failure that does not reduce the protectiongiven by signalling equipment.
Rolling stocktechnician
A person who is authorised and has thenecessary technical competence to examineor repair specified items of equipment formingpart of a train or vehicle.
Route settingposition
Location on a signalling control panel orworkstation from which a route can be set orclosed.
Terms by alphabetical order
28 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Running line A line as shown in Table A of the SectionalAppendix as a passenger line or as anon-passenger line.
Run through (ofpoints)
An incident where a movement runs througha trailing set of points that are not set in thecorrect position for the movement.
SSection signal A stop signal that controls the entrance to a
block section or intermediate block sectionahead.
Semi-automaticsignal
A signal normally operated by the passage oftrains, but can also be controlled from thesignal box or from a ground frame, or by aperson operating a signal post replacementswitch.
Shunt entryboard
A lineside indicator board that indicates theentry of a shunt route on ERTMS cabsignalled lines where lineside signals are notprovided.
Shuntingmovement
Any movement of a train or vehicle other thana train passing normally along a running line.
Shunting signal A signal that is provided for shuntingpurposes only.
Siding A line on which vehicles are marshalled,stabled, loaded, unloaded or serviced clear ofa running line.
Signal postreplacementkey
The key used to operate a signal postreplacement switch.
Signal postreplacementswitch
A switch on the post of an automatic orsemi-automatic colour light signal that can beoperated by a key to turn it to, and keep it at,danger.
12/17 29
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Single line One line is available for movements in bothdirections.
Station Terminal, depot, yard or halt.
Station limits The line between the home signal and thesection signal worked by the same signal boxand in the same direction of travel. This doesnot apply on a track circuit block line.
Stop signal A signal that can show a stop aspect orindication.
Subsidiarysignal
A semaphore signal used for controllingshunting movements and movements ontooccupied tracks. It is always positioned belowthe main semaphore arm with which it isassociated.
Switched off Electrical equipment that is disconnected andseparated from all sources of supply.
TTail lamp Includes an illuminated built-in red light or
blind.
TASS Tilt authorisation and speed supervision. Asystem on tilting trains that controls:• the operation of the tilt system• the speed of the train on routes where
enhanced permissible speeds apply onTASS fitted lines.
Token Any single line token, staff or tablet.
TOWS Train operated warning system. An audiblewarning system at locations listed in theSectional Appendix. When switched on, it isused to warn personnel on or near the lineabout an approaching train.
Terms by alphabetical order
30 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
TPWS Train protection and warning system. Asystem by which a train is stopped by anautomatic application of the brakes whenactivated by lineside equipment.
Track circuit A method of detecting the presence of a trainor vehicle on a line. An electrical device,using the rails as an electrical circuit, detectsthe absence of a train or vehicle. If theserules refer to track circuits, this also includesdetection by axle counters unless speciallyexcluded.
Track circuitactuator
Equipment provided on certain trains toimprove the operation of track circuits.
Track circuitblock
A method of signalling trains in a section ofline using track circuits or other means ofautomatic train absence detection andwithout using block instruments.
Track circuitoperating clip
A device which, in an emergency can beplaced on top of each running rail to operatethe track circuit and protect an obstruction.
Track circuitoperatingdevice (T-COD)
A special device that can be placed on theline to provide protection by operating thetrack circuit, to hold a signal at danger.
Traction unit Locomotive, multiple unit, self-propelled railvehicle or road-rail vehicle operating in railmode.
Trailing points Points where two routes converge.
Train This includes light locomotive, self-propelledrail vehicle or road-rail vehicle in rail mode.
Traincrew Driver and guard.
Train-operatedpoints
Points that are continuously driven to oneposition such that facing movements alwayspass through them in the same direction.Trains themselves operate the points in thetrailing reverse direction.
12/17 31
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Train operator The company responsible for operating atrain.
Train signallingregulations
Instructions for use by the signaller that givedetails of the rules, regulations andinstructions relating to each different kind ofsignalling system.
Transition The process of the onboard ERTMS signalingsystem transferring from one signallingsystem to another. This process has to beacknowledged by the driver.
Trap points Facing points at an exit from a siding orconverging route that derail an unauthorisedmovement, so protecting the adjacent line.
UUncontrolledevacuation
The self evacuation of passengers from atrain, which is not initiated by the driver orguard.
Unworkedpoints
Points that are not operated from a signal boxor ground frame.
WWorked points Points that are operated from a signal box or
ground frame.
Wrong-sidefailure
A failure that reduces or removes theprotection given by signalling equipment.
YYour employer The company, or subsidiary of a larger
organisation for whom you work.
Terms by alphabetical order
32 12/17
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017
Email [email protected] +44 (0) 20 3142 5300Twitter @RSSB_railWeb www.rssb.co.uk
Rail Safety Standards BoardLimitedThe HeliconOne South PlaceLondonEC2M 2RB
Uncontrolled When Printed Document supersedes GERT8000-Gloss Iss 3 and comes into force on 02/12/2017