View source for Bradshaw:Glossary

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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 it is easy to find a specific term.

{{Compacttoc|right=yes|num=yes}}

== 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 ==
[[File:London Overground Class 710.jpg|thumb|A [[London Overground]] [[class 710]], operated by [[Arriva Rail London]], at [[Crouch Hill]].]]
*'''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]] 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.
*'''AOCL''': Automatic Open Crossing, Locally Monitored
*'''ARL''': [[London Overground|Arriva Rail London]]
*'''ARS''': Automatic Route Setting
*'''ASC''': Area Signalling Centre
*'''ASDO''': Automatic Selective Door Opening
*'''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 ==
[[File:British Rail - colour reversed logo.svg|right|thumb|The [[British Rail]] '[[Arrows of Indecision]]'.]]
*'''BML''': [[Brighton Main Line]]
*'''BR''': [[British Rail]]
*'''BTC''': British Transport Commission
*'''BTP''': British Transport Police

== 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]]]]
*'''C+H''': [[Circle line|Circle]] and [[Hammersmith & City line]]s
*'''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|London Underground’s]] SSR as part of the [[#0-9|4LM]] project to enable [[#A|ATO]]. See also [[#T|TBTC]] and [[#D|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.
*'''CIS''': Customer Information System
*'''CLR''': Central London Railway
*'''CM''': Coded Manual
*: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
*'''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 [[#T|TBC]]
*'''CTRL''': Channel Tunnel Rail Link
*'''CWN''': Carriage Working Notice

== D ==
[[File:Tower Gateway DLR station.jpg|right|thumb|[[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 memeber 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
*'''DDA''': Disability Discrimination Act
*'''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. Analagous to [[#O|OPO]] on [[London Underground]]
*'''DRA''': Driver Reminder Appliance
*'''DRM''': Duty Reliability Manager ([[London Underground]] equivalent of [[#M|MOM]].)
*'''DRS''': [[Direct Rail Services]]
*'''DSD''': Driver's Safety Device
*'''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]]
*'''DVA''': Digital Voice Announcer

== E ==
[[File:374022AmsterdamCentraal.jpg|right|thumb|A [[Eurostar]] [[class 374]] at [[Amsterdam Centraal]].]]
*'''E*''': [[Eurostar]]
*'''ECML''': [[East Coast Main Line]]
*'''ECS''': Empty Coaching Stock
*'''EMR''': [[East Midlands Railway]]
*'''EMT''': [[East Midlands Trains]]
*'''EP''': Entry Point
*'''EPH''': Electric Point Heater
*'''ERTMS''': European Rail Traffic Management System
*'''ERU''': Emergency Response Unit
*'''ES''': [[Eurostar]]
*'''ESDC''': Emergency Saloon Door Control
*'''ESR''': Emergency Speed Restriction
*'''ETCS''': European Train Control System

== F ==
[[File:Glory Mine buffer stop.jpeg|right|thumb|The [[FTDotYotYDPMTTASSBBS]] at the [[Glory Mine]] tram stop of [[Crich Tramway Village]].]]
*'''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
*'''[[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 ==
[[File:Class 745 Cerhenice.jpg|right|thumb|A [[Greater Anglia]] [[class 745]] [[FLIRT]] intercity train.]]
*'''GA''': [[Greater Anglia]]
*'''GC''': [[Great Central]]
*'''GEML''': [[Great Eastern Main Line]]
*'''GLA''': Greater London Area
*'''GLA''': Greater London Authority
*'''GLC''': Greater London Council
*'''GN''': [[Great Northern]]
*'''GoA (0-4)''': Grade of Automation
*'''GOP''': Guard's Operating Panel
*'''GSM-R''': Global System for Mobile Communications – Railway
*'''GTR''': [[Govia Thameslink Railway]]
*'''GWML''': [[Great Western Main Line]]
*'''GWR''': [[Great Western Railway]]
*'''GX''': [[Gatwick Express]]

== H ==
[[File:Hull Trains Class 802.jpg|thumb|A [[Hull Trains]] [[class 802]] at [[St. Pancras]]]]
*'''HEX''': [[Heathrow Express]]
*'''HML''': [[Highland Main Line]]
*'''HS1''': High Speed 1
*'''HS2''': High Speed 2
*'''HST''': [[High Speed Train]]
*'''HT''': [[Hull Trains]]

== I ==
[[File:Liverpool Street Interlocking Machine Room (2954778782).jpg|right|thumb|[[Liverpool Street]] Interlocking Machine Room on the [[London Underground]].]]
*'''IBJ''': Insulated Block Joint
*'''IC''': Intercity
*'''IECC''': Integrated Electronic Control Centre
*'''IEP''': Intercity Express Programme
*'''IET''': Intercity Express Train
*'''IMR''': Interlocking Machine Room
*'''IoW''': Isle of Wight

== J ==
[[File:CanadaWater-Jubileeplatforms4.jpg|right|thumb|Platform Edge Doors at [[Canada Water]] station on the [[Jubilee line|Jubilee Line Extension]].]]
*'''JLE''': Jubilee Line Extension
*:The section of the [[Jubilee line]] between Green Park and Stratford, opened in 1999.

== K ==
*'''KYT''': Know Your Train
*'''KVB''': Contrôle de Vitesse par Balises

== L ==
*'''LM''': [[London Midland]]
*'''LNER''': [[London North Eastern Railway]]
*'''LNR''': [[London Northwestern Railway]]
*'''LO''': [[London Overground]]
*'''LOM''': Limit of Movement
*'''LOROL''': [[London Overground|London Overground Rail Operations Ltd.]]
*'''LOS''': Limit of Shunt
*'''LPTB''': London Passenger Transport Board
*'''LRT''': London Regional Transport
*'''LRV''': Light Rail Vehicle
*'''LSL''': Locomotive Services Limited
*'''LT''': London Transport
*'''LTE''': London Transport Executive
*'''LTM''': [[London Transport Museum]]
*'''LTP''': Long Term Plan
*'''LUL''': [[London Underground|London Underground Ltd.]]

== M ==
[[File:METROPOLITAN RAILWAYS LOCO AT THE RAILFEST YORK JUNE 2012 (7346296244).jpg|right|thumb|Metropolitan Railway electric locomotive [[Sarah Siddons]].]]
*'''MDR''': [[District line|Metropolitan District Railway]]
*'''[[MENTOR]]''': Mobile Electric Network Testing Observation and Recording
*'''MML''': [[Midland Main Line]]
*'''MOM''': Mobile Operations Manager
*'''MR''': [[Metropolitan line|Metropolitan Railway]]
*'''MTR''': Mass Transit Railway (Hong Kong Subway)

== N ==
[[File:New Measurement train Danesmoor.jpg|right|thumb|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
*'''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

== O ==
*'''OA''': Open Access
*'''OCS''': Overhead Contact System
*'''OHLE''': Overhead Line Equipment
*'''OLE''': Overhead Line Equipment
*'''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. Analagous to [[#D|DOO]] on [[National Rail]]
*'''ORR''': Office of Rail and Road

== P ==
[[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
*'''PEA''': Passenger Emergency Alarm
*'''PED''': Platform Edge Doors
*'''PEP''': Prototype Electro Pneumatic Train
*'''PIS''': Passenger Information System
*'''PLPR (1-4)''': Plain Line Pattern Recognition
*'''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]]
*'''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
*'''PSR''': Permanent Speed Restriction
*'''PTI''': Platform Train Interface
*'''PTS''': Personal Track Safety

== Q ==
*'''Q Code train''': A train that runs as required

== R ==
[[File:SYRHTT.jpg|right|thumb|A Rail Head Treatment Train at [[Sheffield]] station.]]
*'''RA''': Right Away (Indication)
*'''RAIB''' Rail Accident Investigation Branch
*'''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]]
*'''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 [[#R|RAT]]
*'''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
*'''ROC''' ([[Network Rail]]): Rail Operating Centre
*'''ROC''' ([[SimSig:Sessions]]): [[SimSig:Railway Operating Centre|Railway Operating Centre]]
*'''ROG''': Rail Operations Group
*'''ROGS''': The Railways and Other Guided Transport Systems (Safety) Regulations 2006 (as amended)
*'''RSF''': Right Side Failure
*'''RSSB''': Rail Safety and Standards Board
*'''RTT''': Real Time Trains
*'''RVAR''': Rail Vehicle Accessibility Regulations

== S ==
[[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]].]]
*'''SATS''': Staff Assisted 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]]
*'''SDC''': Service Delivery Centre
*'''SDO''': Selective Door Opening
*:An 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 [[#A|ASDO]] and [[#U|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.
*'''SMA (0.5-14)''': Signal Migration Area
*'''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
[[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
*'''SSI''': Solid State Interlocking
*'''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]]
*'''SSR''': Sub-Surface Railway
*:The [[Circle line|Circle]], [[District line|District]], [[Hammersmith & City line|Hammersmith & City]] and [[Metropolitan line]]s of [[London Underground]]
*'''STANME''': Station Number Names
*'''STANOX''': Station Numbers
*'''STI''': Single track infringement
*'''STN''': Special Train Notice
*'''STP''': Short Term Plan
*'''SWML''': [[South West Main Line]]
*'''SWR''': [[South Western Railway]]
*'''SWT''': [[South West Trains]]

== T ==
[[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.]]
*'''TAS''': Traction Auxillary Set
*'''TAT''': Traction Auxillary Trip
*'''TBC''': Traction Brake Controller
*'''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]]
*'''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.
*'''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 [[#T|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 
*#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.
*'''TMS''': [[Tramway Museum Society]]
*'''TOC''': Train Operating Company
*'''TOD''': Train Operators 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
*'''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 [[#T|TCF]]
*'''TSI''': Technical Specifications for Interoperability
*'''TSR''': Temporary Speed Restriction
*'''TSW''': Train Sim World
*'''TTN''': Timetable Notice
*'''TYT''': Track Your Train

== U ==
*'''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]]
*'''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 underneath trams to enable the signalling system to operate. Similar to [[#V|VRS]]
*'''VOBC''': Vehicle On Board Computer
*'''VRS''': Vehicle Recognition System
*'''VSTP''': Very Short Term Plan
*'''VT''': [[Virgin Trains]]
*'''VTEC''': [[Virgin Trains East Coast]]

== 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]]
*'''WCML''': [[West Coast Main Line]]
*'''WCRC''': [[West Coast Railways|West Coast Railway Company]]
*'''WDM''': Wrong Direction Move
*'''WMR''': [[West Midlands Railway]]
*'''WMT''': [[West Midland Trains]]
*'''WSF''': Wrong Side Failure
*'''WSL''': Wrong Signal Lowered
*'''WTT''': Working Timetable

== X ==
*'''XC''': [[Cross Country]]
*'''XR''': [[Crossrail]]

== Y ==
== Z ==