Bradshaw:Glossary: Difference between revisions

From Bradshaw, the companion guide to On Our Lines
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{{for|three-letter station codes|CRS codes}}
{{for|three-letter station codes|CRS codes}}
{{shortcut|B:G}}
{{shortcut|B:G}}
Not everyone knows all the hundreds of rail-specific acronyms and initialisms, so if any pop up in conversation on the [[Discord]] server add them and their meaning below so others can look them up.


Not everyone knows all the hundreds of rail-specific acronyms and initialisms, so if any pop up in conversation on the [[Discord]] server, add them and their meaning below so others can look them up.
Please keep these in alphabetical order so that it is easy to find a specific term.
 
Please keep these in alphabetical order so it is easy to find a specific term.
 
{{Compacttoc|right=yes|num=yes}}
{{Compacttoc|right=yes|num=yes}}
== 0-9 ==
== 0-9 ==
*'''4LM''': Four Lines Modernisation programme
*'''4LM''': [[Four Lines Modernisation]] programme
*'''4 Foot''' The space between the two running rails on a section of track
*'''4 Foot''' The space between the two running rails on a section of track
*'''6 Foot''' The area between a pair of running lines
*'''6 Foot''' The area between a pair of running lines
*''' 10 Foot''' The area between two pairs of running lines
*''' 10 Foot''' The area between two pairs of running lines
== A ==
== A ==
[[File:London Overground Class 710.jpg|thumb|A [[London Overground]] [[class 710]], operated by [[Arriva Rail London]], at [[Crouch Hill]].]]
*'''AB''': Absolute Block
*'''AB''': Absolute Block
*'''ABCL''': Automatic Barrier Crossing, Locally Monitored
*'''ABCL''': Automatic Barrier Crossing, Locally Monitored
Line 24: Line 19:
*'''AHBC''': Automatic Half-Barrier Crossing
*'''AHBC''': Automatic Half-Barrier Crossing
*'''ANP''': Auto Not Permitted
*'''ANP''': Auto Not Permitted
*: An operating state on [[London Underground]] ATO lines where trains have been prevented from operating in ATO mode and must instead operate in [[#C|CM]] or [[#P|PM]], normally initiated due to staff on our around the track area.
*:An operating state on [[London Underground]] lines using Automatic Train Operations (ATO), where trains have been prevented from operating in ATO mode and must instead operate in [[#C|CM]] or [[#P|PM]], generally initiated due to staff on or around the track area.
*'''AOCL''': Automatic Open Crossing, Locally Monitored
*'''AOCL''': Automatic Open Crossing, Locally Monitored
*'''ARL''': [[London Overground|Arriva Rail London]]
*'''ARL''': [[London Overground|Arriva Rail London]]
Line 32: Line 27:
*'''ATC''': Automatic Train Control
*'''ATC''': Automatic Train Control
*'''ATO''': Automatic Train Operation
*'''ATO''': Automatic Train Operation
*'''ATOC''': Association of Train Operating Companies
*'''ATOC''': [[ATOC|Association of Train Operating Companies]]
*'''ATP''': Automatic Train Protection
*'''ATP''': Automatic Train Protection
*'''ATS''': Automatic Tram Stop
*'''ATS''': Automatic Tram Stop
Line 38: Line 33:
*'''AWC''': [[Avanti West Coast]]
*'''AWC''': [[Avanti West Coast]]
*'''AWS''': Automatic Warning System
*'''AWS''': Automatic Warning System
== B ==
== B ==
[[File:British Rail - colour reversed logo.svg|right|thumb|The [[British Rail]] '[[Arrows of Indecision]]'.]]
[[File:British Rail - colour reversed logo.svg|right|thumb|The [[British Rail]] '[[Arrows of Indecision]]'.]]
Line 45: Line 39:
*'''BTC''': British Transport Commission
*'''BTC''': British Transport Commission
*'''BTP''': British Transport Police
*'''BTP''': British Transport Police
== C ==
== C ==
[[File:Hammersmith tube station (Circle and Hammersmith & City lines) MMB 01 C-Stock.jpg|right|thumb|Hammersmith station, which is the terminus of the [[Circle line|Circle]] and [[Hammersmith & City line|Hammersmith & City Lines]]]]
[[File:Hammersmith tube station (Circle and Hammersmith & City lines) MMB 01 C-Stock.jpg|right|thumb|Hammersmith station, which is the terminus of the [[Circle line|Circle]] and [[Hammersmith & City line|Hammersmith & City Lines]]]]
Line 52: Line 45:
*'''CAWS''': Continuous Automatic Warning System
*'''CAWS''': Continuous Automatic Warning System
*'''CBTC''': Communications Based Train Control
*'''CBTC''': Communications Based Train Control
*: Name given to the SelTrac installation being installed on [[London Underground|London Underground’s]] SSR as part of the [[#0-9|4LM]] project to enable [[#A|ATO]]. See also [[#T|TBTC]] and [[#D|DTG-R]]
*:Name given to the [[SelTrac]] installation being installed on [[London Underground|London Underground’s]] SSR as part of the [[Four Lines Modernisation]] (4LM) project to enable Automatic Train Operation. See also [[#T|TBTC]] and [[#D|DTG-R]]
*'''CD''': Close Doors (Indication)
*'''CD''': Close Doors (indication)
*'''CDL''': Central Door Locking
*'''CDL''': Central Door Locking
*'''CDP''': Continuous Development Programme
*'''CDP''': Continuous Development Programme
*'''Cess''': The area along either side of a railway line which is kept at a lower level than the sleeper bottom, in order to provide drainage.
*'''Cess''': The area along either side of a railway line which is kept at a lower level than the sleeper bottom, in order to provide drainage. May also be considered as a place of safety.
*'''CIS''': Customer Information System
*'''CIS''': Customer Information System
*'''CLR''': Central London Railway
*'''CLR''': Central London Railway
Line 62: Line 55:
*:A mode of operation used on [[London Underground|London Underground’s]] [[Central line|Central]] and [[Victoria line|Victoria]] lines where the Train Operator drives the train manually at up to normal line speed using signalling information provided on an in-cab display. See also [[#P|PM]]
*:A mode of operation used on [[London Underground|London Underground’s]] [[Central line|Central]] and [[Victoria line|Victoria]] lines where the Train Operator drives the train manually at up to normal line speed using signalling information provided on an in-cab display. See also [[#P|PM]]
*'''CMS''': Competency Management System
*'''CMS''': Competency Management System
*'''Corridor of Doom''': A liminal space of substantial length inspired by those located at King's Cross St. Pancras and Green Park stations on the London Underground
*'''(C)[[COS]]''': ([[Crossrail]]) Central Operation Section
*:The [[Elizabeth line]] between [[Abbey Wood]] and [[Paddington]] via Central London. Sometimes incorrectly referred to as the ''Crossrail Core''.
*'''CoT''': Close of Traffic
*'''CoT''': Close of Traffic
*'''CR''': [[Chiltern Railways]]
*'''CR''': [[Chiltern Railways]]
Line 74: Line 70:
*'''CTRL''': Channel Tunnel Rail Link
*'''CTRL''': Channel Tunnel Rail Link
*'''CWN''': Carriage Working Notice
*'''CWN''': Carriage Working Notice
== D ==
== D ==
[[File:Tower Gateway DLR station.jpg|right|thumb|[[Tower Gateway]] station of the [[Docklands Light Railway]] in East London.]]
[[File:Tower Gateway DLR station.jpg|right|thumb|[[Tower Gateway]] station of the [[Docklands Light Railway]] in East London.]]
*'''DCO''': Driver Controlled Operation
*'''DCO''': Driver Controlled Operation
*: A system of operation on the [[National Rail]] network where a train operates with both a driver and at least one other member of staff onboard, but where the driver is responsible for operation of the trains doors as well as driving the train.
*: A system of operation on the [[National Rail]] network where a train operates with both a driver and at least one other member of staff onboard, but where the driver is responsible for operation of the trains doors as well as driving the train.
*'''DCV''': Door Closed Visual
*'''DCV''': Doors Closed Visual
*'''DDA''': Disability Discrimination Act
*'''DDA''': Disability Discrimination Act
*'''DISI''': Defective in Service Instructions
*'''DISI''': Defective in Service Instructions
*'''DLR''': [[Docklands Light Railway]]
*'''DLR''': [[Docklands Light Railway]]
*'''DOO''': Driver Only Operation
*'''DOO''': Driver Only Operation
*: A system of operation on the [[National Rail]] Network where the only member of operational staff onboard a train is the driver who is responsible for all aspects of the trains operation. Analagous to [[#O|OPO]] on [[London Underground]]
*: A system of operation on the [[National Rail]] Network where the only member of operational staff onboard a train is the driver who is responsible for all aspects of the trains operation. Analogous to [[#O|OPO]] on [[London Underground]]
*'''DRA''': Driver Reminder Appliance
*'''DRA''': Driver Reminder Appliance
*'''DRM''': Duty Reliability Manager ([[London Underground]] equivalent of [[#M|MOM]].)
*'''DRM''': Duty Reliability Manager ([[London Underground]] equivalent of Mobile Operations Manager [MOM].)
*'''DRS''': [[Direct Rail Services]]
*'''DRS''': [[Direct Rail Services]]
*'''DSD''': Driver's Safety Device
*'''DSD''': Driver's Safety Device
*'''DTG-R''': Distance to Go Radio
*'''DTG-R''': Distance to Go Radio
*: ATO system in use on [[London Underground|London Underground’s]] [[Victoria line]]. See also [[#C|CBTC]] and [[#T|TBTC]]
*: Automatic Train Operation system in use on [[London Underground|London Underground’s]] [[Victoria line]]. See also [[#C|CBTC]] and [[#T|TBTC]]
*'''DVA''': Digital Voice Announcer
*'''DVA''': Digital Voice Announcer
== E ==
== E ==
[[File:374022AmsterdamCentraal.jpg|right|thumb|A [[Eurostar]] [[class 374]] at [[Amsterdam Centraal]].]]
*'''E*''': [[Eurostar]]
*'''E*''': [[Eurostar]]
*'''ECML''': [[East Coast Main Line]]
*'''ECML''': [[East Coast Main Line]]
Line 109: Line 102:
*'''ESDC''': Emergency Saloon Door Control
*'''ESDC''': Emergency Saloon Door Control
*'''ESR''': Emergency Speed Restriction
*'''ESR''': Emergency Speed Restriction
*'''ESTL''': End State Track Layout, a programme of track rationalisation of the [[London Underground]]'s [[#0-9|Four Lines Modernisation]].
*'''ESTL''': End State Track Layout, a programme of track rationalisation as part of the [[London Underground]]'s [[Four Lines Modernisation]].
*'''ETCS''': European Train Control System
*'''ETCS''': European Train Control System
== F ==
== F ==
[[File:Glory Mine buffer stop.jpeg|right|thumb|The [[FTDotYotYDPMTTASSBBS]] at the [[Glory Mine]] tram stop of [[Crich Tramway Village]].]]
[[File:Class 745 Cerhenice.jpg|right|thumb|A [[Greater Anglia]] [[class 745]] [[FLIRT]] intercity train.]]
*'''FGW''': [[First Great Western]]
*'''FGW''': [[First Great Western]]
*'''[[FLIRT]]''': Fast Light Intercity and Regional Train
*'''[[FLIRT]]''': Fast Light Intercity and Regional Train
Line 120: Line 112:
*'''FPL''': Facing Point Lock
*'''FPL''': Facing Point Lock
*'''FRL''': Fixed Red Light
*'''FRL''': Fixed Red Light
*'''[[FTDotYotYDPMTTASSBBS]]''': The Former Tram Driver of the Year of the Year [[User:Mrdannyp|Daniel Patterson]] Memorial Tramway Tramcar Arrestor System Stop Block Buffer Stop.
== G ==
== G ==
[[File:Class 745 Cerhenice.jpg|right|thumb|A [[Greater Anglia]] [[class 745]] [[FLIRT]] intercity train.]]
*'''GA''': [[Greater Anglia]]
*'''GA''': [[Greater Anglia]]
*'''GBR''': [[Great British Railways]]
*'''GBR''': [[Great British Railways]]
Line 133: Line 122:
*'''GN''': [[Great Northern]]
*'''GN''': [[Great Northern]]
*'''GoA (0-4)''': Grade of Automation
*'''GoA (0-4)''': Grade of Automation
*'''GOBLIN''': Gospel Oak to Barking Line
*'''GOBLIN''': [[Gospel Oak]] to [[Barking]] Line
*'''GOP''': Guard's Operating Panel
*'''GOP''': Guard's Operating Panel
*'''GSM-R''': Global System for Mobile Communications – Railway
*'''GSM-R''': Global System for Mobile Communications – Railway
Line 140: Line 129:
*'''GWR''': [[Great Western Railway]]
*'''GWR''': [[Great Western Railway]]
*'''GX''': [[Gatwick Express]]
*'''GX''': [[Gatwick Express]]
== H ==
== H ==
[[File:Hull Trains Class 802.jpg|thumb|A [[Hull Trains]] [[class 802]] at [[St. Pancras]]]]
[[File:Hull Trains Class 802.jpg|thumb|A [[Hull Trains]] [[class 802]] at [[St. Pancras]]]]
Line 149: Line 137:
*'''HST''': [[High Speed Train]]
*'''HST''': [[High Speed Train]]
*'''HT''': [[Hull Trains]]
*'''HT''': [[Hull Trains]]
== I ==
== I ==
[[File:Liverpool Street Interlocking Machine Room (2954778782).jpg|right|thumb|[[Liverpool Street]] Interlocking Machine Room on the [[London Underground]].]]
[[File:Liverpool Street Interlocking Machine Room (2954778782).jpg|right|thumb|[[Liverpool Street]] Interlocking Machine Room on the [[London Underground]].]]
*'''IBJ''': Insulated Block Joint
*'''IBJ''': Insulated Block Joint (aka IRJ)
*'''IC''': Intercity
*'''IC''': Intercity
*'''IECC''': Integrated Electronic Control Centre
*'''IECC''': Integrated Electronic Control Centre
Line 159: Line 146:
*'''IMR''': Interlocking Machine Room
*'''IMR''': Interlocking Machine Room
*'''IoW''': Isle of Wight
*'''IoW''': Isle of Wight
 
*'''IRJ''': Insulated Rail Joint (aka IBJ)
== J ==
== J ==
[[File:CanadaWater-Jubileeplatforms4.jpg|right|thumb|Platform Edge Doors at [[Canada Water]] station on the [[Jubilee line|Jubilee Line Extension]].]]
[[File:CanadaWater-Jubileeplatforms4.jpg|right|thumb|Platform Edge Doors at [[Canada Water]] station on the [[Jubilee line|Jubilee Line Extension]].]]
Line 165: Line 152:
*'''Jishlish''': [[Jishlish]] is the language and myriad of mistakes spoken and typed by Jish.
*'''Jishlish''': [[Jishlish]] is the language and myriad of mistakes spoken and typed by Jish.
*'''JLE''': Jubilee Line Extension
*'''JLE''': Jubilee Line Extension
*:The section of the [[Jubilee line]] between Green Park and Stratford, opened in 1999.
*:The section of the [[Jubilee line]] between [[Green Park]] and [[Stratford]], opened in 1999.
 
== K ==
== K ==
*'''KYT''': Know Your Train
*'''KVB''': Contrôle de Vitesse par Balises
*'''KVB''': Contrôle de Vitesse par Balises
*:Translated from French to English as Speed Control by Beacons. A speed control system used on the French national rail network, Channel Tunnel and High Speed 1.
*:Translated from French to English as Speed Control by Beacons. A speed control system used on the French national rail network, Channel Tunnel and High Speed 1.
 
*'''KYT''': [[Know Your Train]][https://www.realtimetrains.co.uk/about/knowyourtrain/]
== L ==
== L ==
*'''LM''': [[London Midland]]
*'''LM''': [[London Midland]]
Line 189: Line 174:
*'''LTP''': Long Term Plan
*'''LTP''': Long Term Plan
*'''LUL''': [[London Underground|London Underground Ltd.]]
*'''LUL''': [[London Underground|London Underground Ltd.]]
== M ==
== M ==
[[File:METROPOLITAN RAILWAYS LOCO AT THE RAILFEST YORK JUNE 2012 (7346296244).jpg|right|thumb|Metropolitan Railway electric locomotive [[Sarah Siddons]].]]
[[File:METROPOLITAN RAILWAYS LOCO AT THE RAILFEST YORK JUNE 2012 (7346296244).jpg|right|thumb|Metropolitan Railway electric locomotive [[Sarah Siddons]].]]
Line 198: Line 182:
*'''MR''': [[Metropolitan line|Metropolitan Railway]]
*'''MR''': [[Metropolitan line|Metropolitan Railway]]
*'''MTR''': Mass Transit Railway (Hong Kong Subway)
*'''MTR''': Mass Transit Railway (Hong Kong Subway)
== N ==
== N ==
[[File:New Measurement train Danesmoor.jpg|right|thumb|The [[Network Rail]] [[New Measurement Train]], formed of [[High Speed Train]] rolling stock.]]
[[File:New Measurement train Danesmoor.jpg|right|thumb|The [[Network Rail]] [[New Measurement Train]], formed of [[High Speed Train]] rolling stock.]]
Line 211: Line 194:
*'''NRM''': [[National Railway Museum]]
*'''NRM''': [[National Railway Museum]]
*'''NRN''': National Radio Network
*'''NRN''': National Radio Network
*'''NSE''': Network South East
*'''NSE''': [[Network South East]]
*'''NTCO''': Not To Call Order
*'''NTCO''': Not To Call Order
 
*'''NUCKLE''': NUneaton, Coventry, Kenilworth and LEamington Spa
*:A package of improvement works to the rail corridor between [[Nuneaton]], [[Coventry]], [[Kenilworth]] and [[Leamington Spa]], including new stations, signalling, track and other associated improvements.
== O ==
== O ==
*'''OA''': Open Access
*'''OA''': Open Access
Line 222: Line 206:
*'''OOL''': [[On Our Lines]] (this project)
*'''OOL''': [[On Our Lines]] (this project)
*'''OPO''': One Person Operation
*'''OPO''': One Person Operation
*:The term used by [[London Underground]] to describe the running of trains where the only member of operation staff required is a T/Op. Analagous to [[#D|DOO]] on [[National Rail]]
*:The term used by [[London Underground]] to describe the running of trains where the only member of operation staff required is a T/Op. Analogous to Driver Only Operation (DOO) on [[National Rail]]
*'''OR''': Operational Restriction
*'''OR''': Operational Restriction
*:A limitation placed on the [[#C|CBTC]] system
*:A limitation placed on the [[#C|CBTC]] system
*'''ORR''': Office of Rail and Road
*'''ORR''': Office of Rail and Road
== P ==
== P ==
[[File:4-PEP-4002.jpg|right|thumb|A British Rail 'PEP' unit.]]
[[File:4-PEP-4002.jpg|right|thumb|A British Rail 'PEP' unit.]]
[[File:Townend Signal PPI.jpg|thumb|right|A Points Position Indicator (PPI) below a tram signal on [[Sheffield Supertram]].]]
*'''PDL''': Portsmouth Direct Line
*'''PDL''': Portsmouth Direct Line
*'''PEA''': Passenger Emergency Alarm
*'''PEA''': Passenger Emergency Alarm
*'''PED''': Platform Edge Doors
*'''PED''': Platform Edge Doors
*'''PEP''': Prototype Electro Pneumatic Train
*'''PEP''': Prototype Electro Pneumatic Train. Often used to refer to the classes based on the prototypes; classes [[class 313|313]], [[class 314|314]], [[class 315|315]], [[class 507|507]] & [[class 508|508]].
*'''PIOT''': Passenger Ill on Train
*'''PIS''': Passenger Information System
*'''PIS''': Passenger Information System
*'''PLPR (1-4)''': Plain Line Pattern Recognition
*'''PLPR (1-4)''': Plain Line Pattern Recognition
*'''PM''': Protected Manual
*'''PM''': Protected Manual
*: A mode of operation used on [[London Underground|London Underground’s]] [[Jubilee line|Jubilee]] and [[Northern line|Northern]] lines and the [[#S|SSR]] where [[#A|ATO]] is fitted. In this mode the Train Operator drives the train manually at up to normal line speed using signalling information provided on an in-cab display. See also [[#C|CM]]
*: A mode of operation used on [[London Underground|London Underground’s]] [[Jubilee line|Jubilee]] and [[Northern line|Northern]] lines and parts of the [[Circle line|Circle]], [[District line|District]], [[Hammersmith & City line|Hammersmith & City]] and [[Metropolitan line|Metropolitan lines]] where Automatic Train Operation is provided. In this mode the Train Operator drives the train manually at up to normal line speed using signalling information provided on an in-cab display. See also [[#C|CM]]
*'''PoSA''': Proceed-on-Sight Authority
*'''PoSA''': Proceed-on-Sight Authority
*'''PPE''': Personal Protective Equipment
*'''PPE''': Personal Protective Equipment
Line 246: Line 229:
*'''PSB''': Power Signal Box
*'''PSB''': Power Signal Box
*'''PSD''': Platform Screen Doors
*'''PSD''': Platform Screen Doors
*:Full height doors along the edge of the platform, synchronised to the train doors, that improve safety and can help manage tunnel ventilation
*'''PSR''': Permanent Speed Restriction
*'''PSR''': Permanent Speed Restriction
*'''PTI''': Platform Train Interface
*'''PTI''': Platform Train Interface
*'''PTS''': Personal Track Safety
*'''PTS''': Personal Track Safety
*'''PU''': Pick Up
*'''PU''': Pick Up
 
*:A term used to refer to a member of train crew's next train working
== Q ==
== Q ==
*'''Q Code train''': A train that runs as required
*'''Q Code train''': A train that runs as required
== R ==
== R ==
[[File:SYRHTT.jpg|right|thumb|A Rail Head Treatment Train at [[Sheffield]] station.]]
*'''RA''': Right Away (Indication)
*'''RA''': Right Away (Indication)
*'''RAIB''' Rail Accident Investigation Branch
*'''RAIB''' Rail Accident Investigation Branch
*'''RAT''': Rail Adhesion Train
*'''RAT''': Rail Adhesion Train
*:A train which operates across [[London Underground]] lines in the autumn, spraying sandite onto rails to improve rail head conditions. See also [[#R|RAT]]
*:A number of trains which operate on some [[London Underground]] lines during the autumn, spraying sandite onto rails to improve rail head conditions. See also RHTT
*'''RCC''': Rear Cab Clear (plunger)
*'''RCC''': Rear Cab Clear (plunger)
*'''RDG''': Rail Delivery Group
*'''RDG''': [[Rail Delivery Group]]
*'''REC''': Railway Emergency Call
*'''REC''': Railway Emergency Call
*'''RGI''': Rail Gap Indicator
*'''RGI''': Rail Gap Indicator
*'''RHTT''': Rail Head Treatment Train
*'''RHTT''': Rail Head Treatment Train
*:A train which operates across [[Network Rail]] lines in the autumn, spraying water and sandite onto rails to remove crushed leaf debris, and to improve rail head conditions. See also [[#R|RAT]]
*:A train which operates across [[Network Rail]] lines in the autumn, spraying water and sandite onto rails to remove crushed leaf debris, and to improve rail head conditions. See also RAT
*'''RM''': Restricted Manual
*'''RM''': Restricted Manual
*:A mode of operation used in certain failure situations on London Underground ATO lines, where the Train Operator drives the train manually under authority from the signaller
*:A mode of operation used in certain failure situations on [[London Underground]] lines using Automatic Train Operation (ATO), where the Train Operator drives the train manually under authority from the signaller at a reduced speed.
*'''ROC''' ([[Network Rail]]): Rail Operating Centre
*'''ROC''' ([[Network Rail]]): Rail Operating Centre
*'''ROC''' ([[SimSig:Sessions]]): [[SimSig:Railway Operating Centre|Railway Operating Centre]]
*'''ROC''' ([[SimSig:Sessions]]): [[SimSig:Railway Operations Centre|Railway Operations Centre]]
*'''ROG''': Rail Operations Group
*'''ROG''': [[Rail Operations Group]]
*'''ROGS''': The Railways and Other Guided Transport Systems (Safety) Regulations 2006 (as amended)
*'''ROGS''': The Railways and Other Guided Transport Systems (Safety) Regulations 2006 (as amended)
*'''RR''': Relay Room
*'''RR''': Run(s) as Required
*'''RSF''': Right Side Failure
*'''RSF''': Right Side Failure
*'''RSSB''': Rail Safety and Standards Board
*'''RSSB''': Rail Safety and Standards Board
*'''RSI''': Route Secure Indicator
*'''RSI''': Route Secure Indicator
*:A form of route proving to permit movement during degraded modes of operation on London Underground  
*:A form of route proving to permit movement during degraded modes of operation on London Underground  
*'''RTT''': Real Time Trains
*'''RTT''': [[Real Time Trains]]
*'''RTDI''': Ready To Depart Indicator
*'''RTDI''': Ready To Depart Indicator
*:An ATO dispatch light located on the platforms of London Underground Jubilee and Northern lines.
*:A white beacon located on the platforms of [[London Underground]] [[Jubilee line|Jubilee]] and [[Northern line]]s that is used to aid in train dispatch.
*:White bodyside indicator lights (BILs) on [[S stock]] trains on the London Underground]]'s [[Circle line|Circle]], [[District line|District]], [[Hammersmith & City line|Hammersmith & City]] and [[Metropolitan line]]s which are used to aid in train dispatch.
*'''RVAR''': Rail Vehicle Accessibility Regulations
*'''RVAR''': Rail Vehicle Accessibility Regulations


== S ==
== S ==
[[File:Hugh Llewellyn 19630631832.jpg|right|thumb|A [[ScotRail]] [[class 320]].]]
[[File:Hugh Llewellyn 19630631832.jpg|right|thumb|A [[ScotRail]] [[class 320]].]]
[[File:SI-CAS-SST.jpg|right|thumb|A Section Isolator at Castle Square on [[Sheffield Supertram]].]]
[[File:C69 Stock train at Moorgate 02.jpg|right|thumb|[[Moorgate]] station on [[London Underground|London Underground’s]] Sub-Surface Railway]]
*'''SATS''': Staff Assisted Train Services
*'''SATS''': Station Assistant (Train Services)
*'''SCAT''': Speed Control After Tripping
*'''SCAT''': Speed Control After Tripping
*'''SCC''': Service Control Centre
*'''SCC''': Service Control Centre
Line 300: Line 285:
*'''SLL''': South London Line
*'''SLL''': South London Line
*'''SMA (0.5-14)''': Signal Migration Area
*'''SMA (0.5-14)''': Signal Migration Area
*: Compartmentalised sections of [[London Underground]]'s [[Four Lines Modernisation]] programme. See also [[#0-9|4LM]] and [[#S|SSR]]
*'''SMD''': Stratford Market Depot
*'''SMD''': Stratford Market Depot
*'''SMS''': Safety Management System'''
*'''SMS''': Safety Management System
*'''SN''': [[Southern Rail]]
*'''SN''': [[Southern Rail]]
*'''SoT''': Start of Traffic
*'''SoT''': Start of Traffic
Line 311: Line 297:
*'''SR''': [[ScotRail]]
*'''SR''': [[ScotRail]]
*'''SRA''': Strategic Rail Authority
*'''SRA''': Strategic Rail Authority
[[File:C69 Stock train at Moorgate 02.jpg|right|thumb|[[Moorgate]] station on [[London Underground|London Underground’s]] Sub-Surface Railway]]
*'''SRAWS''': Signal Repeating Automatic Warning System
*'''SRAWS''': Signal Repeating Automatic Warning System
*'''SSI''': Solid State Interlocking
*'''SSI''': Solid State Interlocking
*'''SSM''': Shift Signaller Manager
*'''SSO''': Special Stop Order
*'''SSO''': Special Stop Order
*:An order issued to on-train staff to stop at a station where the train is not otherwise booked to stop at. See also [[#N|NTCO]]
*:An order issued to on-train staff to stop at a station where the train is not otherwise booked to stop at. See also [[#N|NTCO]]
Line 320: Line 306:
*'''STANME''': Station Number Names
*'''STANME''': Station Number Names
*'''STANOX''': Station Numbers
*'''STANOX''': Station Numbers
*'''Step Back''': A procedure use on some [[London Underground]] lines at terminus stations where a train arrives at the terminus and a new Train Operator boards the rear of the train for departure, the original Train Operator then "steps back" onto the next train. This proceudre is used to allow trains to terminate more frequently while allowing Train operators enough time to change ends.
*'''Step Back''': A procedure used on some [[London Underground]] lines at terminus stations where after a train arrives at the terminus a new Train Operator boards the rear of the train for departure, the original Train Operator then "steps back" onto the next train. This procedure is used to allow trains to terminate more frequently while allowing Train Operators enough time to change ends.
*'''STI''': Single track infringement
*'''STI''': Single track infringement
*'''STN''': Special Train Notice
*'''STN''': Special Train Notice
*'''Stock and Crew''':
*'''Stock and Crew''':
*:A type of reform common on London Underground, where two drivers swap trains, taking the train number, destination and passengers with them. It is often used to ensure that trains requiring maintenance attention get back to the correct depots at the end of the day.
*:A type of reform common on [[London Underground]] where two drivers swap trains, taking the train number, destination and passengers with them. It is often used to ensure that trains requiring maintenance attention get back to the correct depots at the end of the day.
*'''STP''': Short Term Plan
*'''STP''': Short Term Plan
*'''SWML''': [[South West Main Line]]
*'''SWML''': [[South West Main Line]]
*'''SWR''': [[South Western Railway]]
*'''SWR''': [[South Western Railway]]
*'''SWT''': [[South West Trains]]
*'''SWT''': [[South West Trains]]
== T ==
== T ==
[[File:700155 Trainbow south of Balcombe.jpg|right|thumb|Thameslink's [[Trainbow]] [[700155]].]]
[[File:700155 Trainbow south of Balcombe.jpg|right|thumb|Thameslink's [[Trainbow]] [[700155]].]]
[[File:London Underground 1938 Stock at Amersham 9.jpg|right|thumb|[[London Underground]]'s [[1938 stock]] at [[Amersham]] on a rail tour.]]
[[File:London Underground 1938 Stock at Amersham 9.jpg|right|thumb|[[London Underground]]'s [[1938 stock]] at [[Amersham]] on a rail tour.]]
*'''TAC''': Track Access Controller
*'''TAC''': Track Access Controller
*'''TAS''': Traction Auxillary Set
*'''TAS''': Traction Auxilliary Set
*'''TAT''': Traction Auxillary Trip
*'''TAT''': Traction Auxilliary Trip
*'''TBC''': Traction Brake Controller
*'''TBC''': Traction Brake Controller
*'''TBTC''': Transmission Based Train Control
*'''TBTC''': Transmission Based Train Control
*:Name given to the SelTrac installation used on [[London Underground|London Underground’s]] [[Jubilee line|Jubilee]] and [[Northern line|Northern]] lines. See also [[#C|CBTC]] and [[#D|DTG-R]]
*:Name given to the [[SelTrac]] installation used on [[London Underground|London Underground’s]] [[Jubilee line|Jubilee]] and [[Northern line|Northern]] lines. See also [[#C|CBTC]] and [[#D|DTG-R]]
*'''TC''': Track Circuit
*'''TC''': Track Circuit
*:Part of the signalling system, where a simple electronic device is used to help detect the presence of a train. See also [[#T|TCF]] and TSF.
*:Part of the signalling system, where a simple electronic device is used to help detect the presence of a train. See also TCF and TSF.
*'''TCB''': Track Circuit Block
*'''TCB''': Track Circuit Block
*'''TCD''': Traffic Controllers Diagrams
*'''TCD''': Traffic Controllers Diagrams
*'''TCF''': Track Circuit Failure
*'''TCF''': Track Circuit Failure
*:The failure of a track circuit used in signalling, giving the signaller an indication that a track circuit is occupied when there is no train present. See also [[#T|TSF]]
*:The failure of a track circuit used in signalling, giving the signaller an indication that a track circuit is occupied when there is no train present. See also TSF
*'''TCP''': Trip Cock Protection
*'''TCP''': Trip Cock Protection
*'''TD''' ([[London Underground]]): Train Description
*'''TD''' ([[London Underground]]): Train Description
Line 353: Line 338:
*'''TIPLOC''': Timing Point Location
*'''TIPLOC''': Timing Point Location
*'''TL''': [[Thameslink]]
*'''TL''': [[Thameslink]]
*'''TMS''': Train Management System  
*'''TMS''': Train Management System
*:Onboard computer on trains which monitors the status of various systems and may manage the onboard information system.
*:Onboard computer on trains which monitors the status of various systems and may manage the onboard information system.
*'''TMS''': Tram Management System  
*'''TMS''': Tram Management System
*#Onboard computer on trams which monitors the status of various systems and may manage the onboard information system.
*#Onboard computer on trams which monitors the status of various systems and may manage the onboard information system.
*#Signalling system used on the Manchester Metrolink.
*#Signalling system used on the [[Manchester Metrolink]].
*'''TMS''': [[Tramway Museum Society]]
*'''TMS''': [[Tramway Museum Society]]
*'''TO''': Technical Officer
*'''TO''': Technical Officer
*'''TOC''': Train Operating Company
*'''TOC''': Train Operating Company
*'''TOD''': Train Operators Display
*'''TOD''': Train Operator's Display
*:In cab display on 1995 & 1996 tube stock trains used to display train speed and signalling information to the Train Operator.
*:In cab display on [[1995 stock|1995]] & [[1996 stock|1996 tube stock]] trains used to display train speed and signalling information to the Train Operator
*'''T/Op''': Train Operator
*'''T/Op''': Train Operator
*'''TOPS''': Total Operations Processing System
*'''TOPS''': Total Operations Processing System
Line 379: Line 364:
*'''TSC''': Transport Strategy Centre
*'''TSC''': Transport Strategy Centre
*'''TSF''': Track Section Failure
*'''TSF''': Track Section Failure
*:The failure of a track circuit, or axle counter, used in signalling to give the signaller an indication of where a train is located. See also [[#T|TCF]]
*:The failure of a track circuit, or axle counter, used in signalling to give the signaller an indication of where a train is located. See also TCF
*'''TSI''': Technical Specifications for Interoperability
*'''TSI''': Technical Specifications for Interoperability
*'''TSR''': Temporary Speed Restriction
*'''TSR''': Temporary Speed Restriction
*'''TSW''': Train Sim World
*'''TSW''': Train Sim World
*'''TTN''': Timetable Notice
*'''TTN''': Timetable Notice
*'''TYT''': Track Your Train
*'''TYT''': [[Track Your Train]][https://www.realtimetrains.co.uk/about/trackyourtrain/]
 
== U ==
== U ==
*'''UDS''': Unit Deselect
*'''UDS''': Unit Deselect
*:A form of [[#S|SDO]] where the doors are disabled on a per-unit basis. See also [[#A|ASDO]] and [[#S|SDO]]
*:A form of Selective Door Operation (SDO) where the doors are disabled on a per-unit basis. See also [[#A|ASDO]] and [[#S|SDO]]
*'''UERL''': Underground Electric Railway Company of London
*'''UERL''': Underground Electric Railway Company of London
*'''UTC''': Urban Traffic Control
*'''UTC''': Urban Traffic Control
*:A system that interfaces with tramway signalling to ensure balanced traffic flow and tram priority.
*:A system that interfaces with tramway signalling to ensure balanced traffic flow and tram priority
*'''UTO''': Unattended Train Operation
*'''UTO''': Unattended Train Operation
*:A form of train operation, where trains operate automatically without any members of staff onboard.
*:A form of train operation where trains operate automatically without any members of staff onboard
*'''UTU''': Ultrasonic Test Unit
*'''UTU''': Ultrasonic Test Unit
*'''UWC''': User Worked Crossing
*'''UWC''': User Worked Crossing
== V ==
== V ==
*'''VAR''': Varied Timetable
*'''VAR''': Varied Timetable
*'''VCC''': Vehicle Control Centre
*'''VCC''': Vehicle Control Centre
*'''VIS''': Vehicle Identification System
*'''VIS''': Vehicle Identification System
*:Signalling system used on tramways, using loops resting on sleepers or underneath roads and receivers underneath trams to enable the signalling system to operate. Similar to [[#V|VRS]]
*:Signalling system used on tramways, using loops resting on sleepers or underneath roads and receivers below trams to enable the signalling system to operate. Similar to VRS
*'''VOBC''': Vehicle On Board Computer
*'''VOBC''': Vehicle On Board Computer
*'''VRS''': Vehicle Recognition System
*'''VRS''': Vehicle Recognition System
Line 407: Line 390:
*'''VT''': [[Virgin Trains]]
*'''VT''': [[Virgin Trains]]
*'''VTEC''': [[Virgin Trains East Coast]]
*'''VTEC''': [[Virgin Trains East Coast]]
== W ==
== W ==
[[File:139002SBT.jpg|right|thumb|[[West Midlands Railway]]'s [[class 139]] [[Parry People Mover]] on the [[Stourbridge Town]] branch line.]]
*'''WAML''': [[West Anglia Main Line]]
*'''WAML''': [[West Anglia Main Line]]
*'''WCML''': [[West Coast Main Line]]
*'''WCML''': [[West Coast Main Line]]
Line 417: Line 398:
*'''WMR''': [[West Midlands Railway]]
*'''WMR''': [[West Midlands Railway]]
*'''WMT''': [[West Midland Trains]]
*'''WMT''': [[West Midland Trains]]
*'''Wide to Gauge''': A variation of trap points set neither in the normal nor reverse position for overrun mitigation
*'''WSF''': Wrong Side Failure
*'''WSF''': Wrong Side Failure
*'''WSL''': Wrong Signal Lowered
*'''WSL''': Wrong Signal Lowered
**'''WSLA''': Wrong Signal Lowered and Accepted
*'''WSLA''': Wrong Signal Lowered and Accepted
*'''WTT''': Working Timetable
*'''WTT''': Working Timetable
== X ==
== X ==
*'''XC''': [[Cross Country]]
*'''XC''': [[Cross Country]]
*'''XR''': [[Crossrail]]
*'''XR''': [[Crossrail]]
== Y ==
== Y ==
*'''Yellow Peril:''' Colloquial name for a London Underground staff circular briefing which details significant changes to signalling arrangements, such as the commissioning of a new signal cabin or modern automatic train control system
*'''Yellow Peril:''' Colloquial name for a staff circular briefing which details significant changes to signalling arrangements, such as the commissioning of a new signal cabin or modern automatic train control system
 
== Z ==
== Z ==

Latest revision as of 23:02, 14 March 2024

For three-letter station codes, see CRS codes.
Shortcut

Not everyone knows all the hundreds of rail-specific acronyms and initialisms, so if any pop up in conversation on the Discord server add them and their meaning below so others can look them up.

Please keep these in alphabetical order so that it is easy to find a specific term.


0-9

  • 4LM: Four Lines Modernisation programme
  • 4 Foot The space between the two running rails on a section of track
  • 6 Foot The area between a pair of running lines
  • 10 Foot The area between two pairs of running lines

A

  • AB: Absolute Block
  • ABCL: Automatic Barrier Crossing, Locally Monitored
  • ABDO: Automatic Braking and Door Opening
  • ACOA: Adverse Change Of Aspect
  • ACWN: Altered Carriage Working Notice
  • AHB: Automatic Half-Barrier Crossing
  • AHBC: Automatic Half-Barrier Crossing
  • ANP: Auto Not Permitted
    An operating state on London Underground lines using Automatic Train Operations (ATO), where trains have been prevented from operating in ATO mode and must instead operate in CM or PM, generally initiated due to staff on or around the track area.
  • AOCL: Automatic Open Crossing, Locally Monitored
  • ARL: Arriva Rail London
  • ARS: Automatic Route Setting
  • ASC: Area Signalling Centre
  • ASDO: Automatic Selective Door Opening. See also SDO and UDS
  • ATC: Automatic Train Control
  • ATO: Automatic Train Operation
  • ATOC: Association of Train Operating Companies
  • ATP: Automatic Train Protection
  • ATS: Automatic Tram Stop
  • ATW: Arriva Trains Wales
  • AWC: Avanti West Coast
  • AWS: Automatic Warning System

B

The British Rail 'Arrows of Indecision'.

C

Hammersmith station, which is the terminus of the Circle and Hammersmith & City Lines
  • C+H: Circle and Hammersmith & City lines
  • CAPE: Cancelled At Point of Entry
  • CAWS: Continuous Automatic Warning System
  • CBTC: Communications Based Train Control
    Name given to the SelTrac installation being installed on London Underground’s SSR as part of the Four Lines Modernisation (4LM) project to enable Automatic Train Operation. See also TBTC and DTG-R
  • CD: Close Doors (indication)
  • CDL: Central Door Locking
  • CDP: Continuous Development Programme
  • Cess: The area along either side of a railway line which is kept at a lower level than the sleeper bottom, in order to provide drainage. May also be considered as a place of safety.
  • CIS: Customer Information System
  • CLR: Central London Railway
  • CM: Coded Manual
    A mode of operation used on London Underground’s Central and Victoria lines where the Train Operator drives the train manually at up to normal line speed using signalling information provided on an in-cab display. See also PM
  • CMS: Competency Management System
  • Corridor of Doom: A liminal space of substantial length inspired by those located at King's Cross St. Pancras and Green Park stations on the London Underground
  • (C)COS: (Crossrail) Central Operation Section
    The Elizabeth line between Abbey Wood and Paddington via Central London. Sometimes incorrectly referred to as the Crossrail Core.
  • CoT: Close of Traffic
  • CR: Chiltern Railways
  • CRS: Computer Reservation System
  • CS: Caledonian Sleeper
  • CSA: Customer Service Assistant
  • CSDE: Correct Side Door Enable
  • CSL2: Customer Service Level 2
  • CSLR: City & South London Railway
  • CSR: Cab Secure Radio
  • CTBC: Combined Traction Brake Controller, See also TBC
  • CTRL: Channel Tunnel Rail Link
  • CWN: Carriage Working Notice

D

Tower Gateway station of the Docklands Light Railway in East London.
  • DCO: Driver Controlled Operation
    A system of operation on the National Rail network where a train operates with both a driver and at least one other member of staff onboard, but where the driver is responsible for operation of the trains doors as well as driving the train.
  • DCV: Doors Closed Visual
  • DDA: Disability Discrimination Act
  • DISI: Defective in Service Instructions
  • DLR: Docklands Light Railway
  • DOO: Driver Only Operation
    A system of operation on the National Rail Network where the only member of operational staff onboard a train is the driver who is responsible for all aspects of the trains operation. Analogous to OPO on London Underground
  • DRA: Driver Reminder Appliance
  • DRM: Duty Reliability Manager (London Underground equivalent of Mobile Operations Manager [MOM].)
  • DRS: Direct Rail Services
  • DSD: Driver's Safety Device
  • DTG-R: Distance to Go Radio
    Automatic Train Operation system in use on London Underground’s Victoria line. See also CBTC and TBTC
  • DVA: Digital Voice Announcer

E

F

A Greater Anglia class 745 FLIRT intercity train.
  • FGW: First Great Western
  • FLIRT: Fast Light Intercity and Regional Train
  • FOC: Freight Operating Company
  • FPI: Facing Points Indicator
  • FPL: Facing Point Lock
  • FRL: Fixed Red Light

G

H

File:Hull Trains Class 802.jpg
A Hull Trains class 802 at St. Pancras

I

Liverpool Street Interlocking Machine Room on the London Underground.
  • IBJ: Insulated Block Joint (aka IRJ)
  • IC: Intercity
  • IECC: Integrated Electronic Control Centre
  • IEP: Intercity Express Programme
  • IET: Intercity Express Train
  • IMR: Interlocking Machine Room
  • IoW: Isle of Wight
  • IRJ: Insulated Rail Joint (aka IBJ)

J

Platform Edge Doors at Canada Water station on the Jubilee Line Extension.
  • Jish: Also known as Josh.
  • Jishlish: Jishlish is the language and myriad of mistakes spoken and typed by Jish.
  • JLE: Jubilee Line Extension
    The section of the Jubilee line between Green Park and Stratford, opened in 1999.

K

  • KVB: Contrôle de Vitesse par Balises
    Translated from French to English as Speed Control by Beacons. A speed control system used on the French national rail network, Channel Tunnel and High Speed 1.
  • KYT: Know Your Train[1]

L

M

Metropolitan Railway electric locomotive Sarah Siddons.

N

The Network Rail New Measurement Train, formed of High Speed Train rolling stock.
  • NCT: Non-Communicating Train
  • NIRM: Network Incident Response Manager
  • NLC: National Location Codes
  • NLE: Northern Line Extension
  • NLL: North London Line
  • NMT: New Measurement Train
  • NR: Network Rail
  • NR: Northern Rail
  • NRM: National Railway Museum
  • NRN: National Radio Network
  • NSE: Network South East
  • NTCO: Not To Call Order
  • NUCKLE: NUneaton, Coventry, Kenilworth and LEamington Spa
    A package of improvement works to the rail corridor between Nuneaton, Coventry, Kenilworth and Leamington Spa, including new stations, signalling, track and other associated improvements.

O

  • OA: Open Access
  • OCS: Overhead Contact System
  • OHLE: Overhead Line Equipment
  • OLE: Overhead Line Equipment
  • ONA: Operator Not Available
  • OOL: On Our Lines (this project)
  • OPO: One Person Operation
    The term used by London Underground to describe the running of trains where the only member of operation staff required is a T/Op. Analogous to Driver Only Operation (DOO) on National Rail
  • OR: Operational Restriction
    A limitation placed on the CBTC system
  • ORR: Office of Rail and Road

P

A British Rail 'PEP' unit.
  • PDL: Portsmouth Direct Line
  • PEA: Passenger Emergency Alarm
  • PED: Platform Edge Doors
  • PEP: Prototype Electro Pneumatic Train. Often used to refer to the classes based on the prototypes; classes 313, 314, 315, 507 & 508.
  • PIOT: Passenger Ill on Train
  • PIS: Passenger Information System
  • PLPR (1-4): Plain Line Pattern Recognition
  • PM: Protected Manual
    A mode of operation used on London Underground’s Jubilee and Northern lines and parts of the Circle, District, Hammersmith & City and Metropolitan lines where Automatic Train Operation is provided. In this mode the Train Operator drives the train manually at up to normal line speed using signalling information provided on an in-cab display. See also CM
  • PoSA: Proceed-on-Sight Authority
  • PPE: Personal Protective Equipment
  • PPI: Points Position Indicator
  • PRI: Preliminary Route Indicator
  • PRM: Persons with Reduced Mobility
  • PSA: Passenger Service Agent
  • PSB: Power Signal Box
  • PSD: Platform Screen Doors
    Full height doors along the edge of the platform, synchronised to the train doors, that improve safety and can help manage tunnel ventilation
  • PSR: Permanent Speed Restriction
  • PTI: Platform Train Interface
  • PTS: Personal Track Safety
  • PU: Pick Up
    A term used to refer to a member of train crew's next train working

Q

  • Q Code train: A train that runs as required

R

  • RA: Right Away (Indication)
  • RAIB Rail Accident Investigation Branch
  • RAT: Rail Adhesion Train
    A number of trains which operate on some London Underground lines during the autumn, spraying sandite onto rails to improve rail head conditions. See also RHTT
  • RCC: Rear Cab Clear (plunger)
  • RDG: Rail Delivery Group
  • REC: Railway Emergency Call
  • RGI: Rail Gap Indicator
  • RHTT: Rail Head Treatment Train
    A train which operates across Network Rail lines in the autumn, spraying water and sandite onto rails to remove crushed leaf debris, and to improve rail head conditions. See also RAT
  • RM: Restricted Manual
    A mode of operation used in certain failure situations on London Underground lines using Automatic Train Operation (ATO), where the Train Operator drives the train manually under authority from the signaller at a reduced speed.
  • ROC (Network Rail): Rail Operating Centre
  • ROC (SimSig:Sessions): Railway Operations Centre
  • ROG: Rail Operations Group
  • ROGS: The Railways and Other Guided Transport Systems (Safety) Regulations 2006 (as amended)
  • RR: Relay Room
  • RR: Run(s) as Required
  • RSF: Right Side Failure
  • RSSB: Rail Safety and Standards Board
  • RSI: Route Secure Indicator
    A form of route proving to permit movement during degraded modes of operation on London Underground
  • RTT: Real Time Trains
  • RTDI: Ready To Depart Indicator
    A white beacon located on the platforms of London Underground Jubilee and Northern lines that is used to aid in train dispatch.
    White bodyside indicator lights (BILs) on S stock trains on the London Underground]]'s Circle, District, Hammersmith & City and Metropolitan lines which are used to aid in train dispatch.
  • RVAR: Rail Vehicle Accessibility Regulations

S

A ScotRail class 320.
Moorgate station on London Underground’s Sub-Surface Railway
  • SATS: Station Assistant (Train Services)
  • SCAT: Speed Control After Tripping
  • SCC: Service Control Centre
  • SCD: Short Circuiting Device
  • SCL1: Service Controller Level 1
  • SCL2: Service Controller Level 2
  • ScR: ScotRail
  • SD: Set Down
  • SDC: Service Delivery Centre
  • SDO: Selective Door Opening
    A system where on-train staff select a number of doors, or carriages, to open instead of opening all doors in locations where there is a short platform. See also ASDO and UDS
  • SE: Southeastern
  • SI: Section Isolator
    A break in the overhead wires, where two sections of wire are isolated from each other allowing current to either section to be isolated for maintenance. Also called a Section Insulator.
  • SLL: South London Line
  • SMA (0.5-14): Signal Migration Area
    Compartmentalised sections of London Underground's Four Lines Modernisation programme. See also 4LM and SSR
  • SMD: Stratford Market Depot
  • SMS: Safety Management System
  • SN: Southern Rail
  • SoT: Start of Traffic
  • SotD: Signal of the Day
  • SPAD: Signal Passed At Danger
  • SPAR: Signal Passed At Red
  • SPAS: Signal Passed At Stop
  • SPT: Signal Post Telephone
  • SR: ScotRail
  • SRA: Strategic Rail Authority
  • SRAWS: Signal Repeating Automatic Warning System
  • SSI: Solid State Interlocking
  • SSM: Shift Signaller Manager
  • SSO: Special Stop Order
    An order issued to on-train staff to stop at a station where the train is not otherwise booked to stop at. See also NTCO
  • SSR: Sub-Surface Railway
    The Circle, District, Hammersmith & City and Metropolitan lines of London Underground
  • STANME: Station Number Names
  • STANOX: Station Numbers
  • Step Back: A procedure used on some London Underground lines at terminus stations where after a train arrives at the terminus a new Train Operator boards the rear of the train for departure, the original Train Operator then "steps back" onto the next train. This procedure is used to allow trains to terminate more frequently while allowing Train Operators enough time to change ends.
  • STI: Single track infringement
  • STN: Special Train Notice
  • Stock and Crew:
    A type of reform common on London Underground where two drivers swap trains, taking the train number, destination and passengers with them. It is often used to ensure that trains requiring maintenance attention get back to the correct depots at the end of the day.
  • STP: Short Term Plan
  • SWML: South West Main Line
  • SWR: South Western Railway
  • SWT: South West Trains

T

Thameslink's Trainbow 700155.
London Underground's 1938 stock at Amersham on a rail tour.
  • TAC: Track Access Controller
  • TAS: Traction Auxilliary Set
  • TAT: Traction Auxilliary Trip
  • TBC: Traction Brake Controller
  • TBTC: Transmission Based Train Control
    Name given to the SelTrac installation used on London Underground’s Jubilee and Northern lines. See also CBTC and DTG-R
  • TC: Track Circuit
    Part of the signalling system, where a simple electronic device is used to help detect the presence of a train. See also TCF and TSF.
  • TCB: Track Circuit Block
  • TCD: Traffic Controllers Diagrams
  • TCF: Track Circuit Failure
    The failure of a track circuit used in signalling, giving the signaller an indication that a track circuit is occupied when there is no train present. See also TSF
  • TCP: Trip Cock Protection
  • TD (London Underground): Train Description
  • TD (Network Rail): Train Describer
  • TfGM: Transport for Greater Manchester
  • TfL: Transport for London
  • TfW: Transport for Wales
  • TIPLOC: Timing Point Location
  • TL: Thameslink
  • TMS: Train Management System
    Onboard computer on trains which monitors the status of various systems and may manage the onboard information system.
  • TMS: Tram Management System
    1. Onboard computer on trams which monitors the status of various systems and may manage the onboard information system.
    2. Signalling system used on the Manchester Metrolink.
  • TMS: Tramway Museum Society
  • TO: Technical Officer
  • TOC: Train Operating Company
  • TOD: Train Operator's Display
    In cab display on 1995 & 1996 tube stock trains used to display train speed and signalling information to the Train Operator
  • T/Op: Train Operator
  • TOPS: Total Operations Processing System
  • TPE: TransPennine Express
  • TPH: Trains Per Hour
  • TPI: Trailing Points Indicator
  • TPS: Train Planning System
  • TPWS: Train Protection and Warning System
  • Tracks down: Slang for Track Circuit Failure
  • TRC: Track Recording Car
  • TRT: Track Recording Train
  • TRTS: Train Ready To Start
  • TRU: Track Recording Unit
  • TRV: Track Recording Vehicle
  • TS: Tube Stock
  • TSC: Transport Strategy Centre
  • TSF: Track Section Failure
    The failure of a track circuit, or axle counter, used in signalling to give the signaller an indication of where a train is located. See also TCF
  • TSI: Technical Specifications for Interoperability
  • TSR: Temporary Speed Restriction
  • TSW: Train Sim World
  • TTN: Timetable Notice
  • TYT: Track Your Train[2]

U

  • UDS: Unit Deselect
    A form of Selective Door Operation (SDO) where the doors are disabled on a per-unit basis. See also ASDO and SDO
  • UERL: Underground Electric Railway Company of London
  • UTC: Urban Traffic Control
    A system that interfaces with tramway signalling to ensure balanced traffic flow and tram priority
  • UTO: Unattended Train Operation
    A form of train operation where trains operate automatically without any members of staff onboard
  • UTU: Ultrasonic Test Unit
  • UWC: User Worked Crossing

V

  • VAR: Varied Timetable
  • VCC: Vehicle Control Centre
  • VIS: Vehicle Identification System
    Signalling system used on tramways, using loops resting on sleepers or underneath roads and receivers below trams to enable the signalling system to operate. Similar to VRS
  • VOBC: Vehicle On Board Computer
  • VRS: Vehicle Recognition System
  • VSTP: Very Short Term Plan
  • VT: Virgin Trains
  • VTEC: Virgin Trains East Coast

W

X

Y

  • Yellow Peril: Colloquial name for a staff circular briefing which details significant changes to signalling arrangements, such as the commissioning of a new signal cabin or modern automatic train control system

Z

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