Delay Attribution Guide

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The Delay Attribution Guide contains a list of delay attribution codes and reasons. The same codes are used in Train Cancellation messages sent on the Train Movements feed. The current (September 2016) codes are listed here for reference.

Codes are grouped in to several sections:

  • A* - Freight Terminal Operations Causes
  • D* - Departmental Holding Cause Code
  • F* - Freight Train Operator causes (excluding Fleet and Terminal problems)
  • I* and J* - Non Passenger’s Charter Excludable infrastructure problems
  • M* and N* - Passenger and Freight Train Operator Fleet problems
  • O* - Network Rail operating causes
  • P* - Planned or Excluded delays/cancellations
  • Q* - Network Rail internal non-operating causes
  • R* - Station operating causes
  • T* - Passenger Train Operator causes (excluding Fleet and Station problems)
  • V* - Passenger’s Charter excludable events the responsibility of Passenger Train Operators
  • X* - Passenger’s Charter excludable events the responsibility of Network Rail
  • Y* - Reactionary/consequential delays arising as a result of trains being delayed earlier by a given incident
  • Z* - Unexplained delays and cancellations

Delay Attribution Codes

Code Cause Abbreviation
AA Waiting acceptance into off Network Terminal or Yard ACCEPTANCE
AC Waiting train preparation or completion of TOPS list/RT3973 TRAIN PREP
AD Off Network Terminal or Yard staff shortage including reactionary congestion caused by the shortage WTG STAFF
AE Congestion in off Network Terminal or Yard CONGESTION
AG Wagon load incident including adjusting loads or open door LOAD INCDT
AH Customer or off Network yard equipment breakdown/reduced capacity YARD EQUIP
AJ Waiting Customer’s traffic including documentation TRAFFIC
AK Safety incidents and mishaps (e.g. derailments, fire or chemical spill) in off Network Rail network freight yard or terminal (including private sidings, and stations – where it affects FOC services) YARDSAFETY
AX Failure of off network infrastructure (FOC or private) OFFNET INF
AZ Other Freight Operating Company. Cause to be specified, including mishaps in off Network terminals or yards YARD OTHER
DA Non Technical Fleet Holding Code HOLD NT FL
DB Train Operations Holding Code HOLD T-OPS
DC Train Crew Causes Holding Code HOLD T-CRW
DD Technical Fleet Holding Code HOLD T FL
DE Station Causes Holding Code HOLD STN
DF External Causes Holding Code HOLD EXT
DG Freight Terminal and or Yard Holding Code HOLD YARD
DH Adhesion and or Autumn Holding Code HOLD AUTM
FA Dangerous goods incident DANG GOODS
FC Freight train driver FOC DRIVER
FE Train crew not available NO T/CREW
FG Driver adhering to company professional driving standards or policy PRO DRIVER
FH Planning issues including loco diagrams or RT3973 restriction not requested PLAN ISSUE
FI Delay in running due to the incorrect operation of the on- board ETCS/ ERTMS equipment - i.e. wrong input by driver. ETCS INPUT
FJ Train held at FOC request HOLD REQST
FK Train diverted or re-routed at FOC request DIVERT REQ
FL Train cancelled at FOC request or planned not to run CANCEL REQ
FM Tail lamp/head lamp out or incorrectly shown LAMP ISSUE
FN Late presentation from Europe LATE CHUNL
FO Delay in running believed to be due to train operator, but no information available from that Operator FOC UNEX
FP Incorrect route taken or route wrongly challenged by driver, including SPAD's FOC ROUTE
FS Delay due to ETCS/ ERTMS on-board overriding driver command ETCS OVRD
FT Freight Operator autumn-attribution Neutral Zone delays LF NEUTRAL
FW Late start or yard overtime not explained by Train Operator LATE START
FX Freight train running at lower class or speed than planned classification or overweight TRAIN SPEC
FZ Other FOC causes incl. FOC control directive, cause to be specified, including mishaps. FOC OTHER
I0 Telecom equipment failures legacy (inc. NRN/CSR/RETB link) RADIO FLR
I1 Overhead line/third rail defect OHL/3 RAIL
I2 AC/DC trip AC/DC TRIP
I4 OHL/third rail power supply failure or reduction SUPPLY FLR
I5 Possession over-run from planned work OVERRUN
I6 Delays as a result of track patrolling blocks TRK PATROL
I7 Engineer's train late or failed in possession ENGNRS TRN
I8 Animal Strike/Incursion within the control of Network Rail ANIMAL
I9 Fires starting on Network Rail Infrastructure INFRA FIRE
IA Signal failure SIGNAL FLR
IB Points failure POINTS FLR
IC Track circuit failure TC FAILURE
ID Level crossing failure incl. barrow/foot crossings and crossing treadles LEVEL XING
IE Signalling functional power supply failure SIG FUNC PWR
IF Train Describer/Panel/ARS/SSI/TDM/Remote Control failure PANEL FLR
IG Block failure BLOCK FLR
IH Power supply and distribution system failure PWR SUP DIS
II Signalling lineside cable fault SIG CABLE
IJ AWS/ATP/TPWS/Train Stop/On-track equipment failure AWS/ATP
IK Telephone equipment failure TELECOMS
IL Token equipment failure TOKEN FLR
IM Infrastructure Balise Failure BALISE FLR
IN HABD/Panchex/WILD/Wheelchex HABD FAULT
IP Points failure caused by snow or frost where heaters are fitted but found to be not operative or defective POINT HEAT
IQ Trackside sign blown down, missing, defective, mis-placed TRACK SIGN
IR Broken/cracked/twisted/buckled/flawed rail RAIL FLAW
IS Track defects (other than rail defects i.e. fish plates, wet beds etc) TRACK FLT
IT Bumps reported - cause not known TRACK NFF
IV Earthslip/subsidence/breached sea defences (not the result of severe weather on the day of failure) EARTHSLIP
IW Non severe weather - snow/ice/frost affecting infrastructure equipment INF WEATHR
IZ Other infrastructure causes INF OTHER
J0 Telecom radio failures IVRS/GSM-R GSM-R FLR
J2 Network Rail train dispatch equipment failure excluding telecoms equipment TRTS FLR
J3 Axle Counter Failure AXLE C FLR
J4 Infrastructure Safety Issue Reported by Member of the Public – No Fault Found MOP NFF
J5 Infrastructure Fault Report Proven to be mistaken MIS REPORT
J6 Lightning strike against unprotected assets LIGHTNING
J7 ETCS/ ERTMS Equipment Failure (excluding communications link and balises) ETCS FLR
J8 Damage to infrastructure caused by on-track machine whilst operating in a possession OTM DAMAGE
J9 Preventative Maintenance to the infrastructure in response to a Remote Condition Monitoring Alert RCM ALERT
JA TSR speeds for Track-work outside the Rules of the Route TSRNOT EAS
JB Reactionary Delay to 'P' coded TSR TSR REACTN
JD Structures - Bridges/tunnels/buildings/ embankments (not bridge strikes) STRUCTURES
JG ESR/TSR due to works not completed or cancelled possession (where restriction did not exist prior to possession) ESR/TSR
JH Critical Rail Temperature speeds, (other than buckled rails) HEAT SPEED
JK Flooding not due to exceptional weather FLOODING
JL Network Rail staff oversight or error (Maintenance / Infrastructure) STAFF ERR
JP Failure to maintain vegetation within network boundaries in accordance with prevailing Network Rail standards, including where signals are obscured and a train strikes branches. VEGETATION
JS Condition of Track TSR outside the Timetable Planning Rules TRACK COND
JT Points failure caused by snow or frost where heaters are not fitted NO PNT HTR
JX Miscellaneous items (including trees) causing obstructions, not the result of trespass, vandalism, weather or fallen/thrown from trains MISC OBJCT
M0 Confirmed train cab based safety system fault (including GSM-R) CAB SAFETY
M1 Confirmed Pantograph ADD, shoe beam or assoc.system faults Incl. positive PANCHEX activations PANTO/SHOE
M7 Door and Door system faults DOORS
M8 Other technical failures above the Solebar ABOVE SBAR
M9 Reported fleet equipment defect - no fault found FLEET NFF
MB Electric loco failure, defect, attention. ELEC LOCO
MC Diesel loco failure, defect, attention. DIESL LOCO
MD Other technical failures below the solebar BELOW SBAR
ME Steam locomotive failure/defect/attention STEAM LOCO
MF International/Channel Tunnel locomotive failure/defect/attention CHUNL LOCO
ML Wagons, coaches and parcel vehicle faults WAGN/COACH
MN Brake and brake systems faults; including wheel flats where no other cause had been identified BRAKE/WHLS
MP Rail / wheel interface, adhesion problems (including ice on the running rail) ADHESION
MR Sanders and scrubber faults SANDER
MS Planned underpowered or shortformed service and or vehicle, incl. exam set swaps ALOC STOCK
MT Confirmed train borne safety system faults (not cab based) SYST FAULT
MU Depot operating problem DEPOT OPS
MV EngineerÕs on-track equipment failure outside possession ON-TRACK
MW Weather - effect on T&RS equipment WEATHR FLT
MY Coupler and Coupler system faults COUPLER
NA On-train TASS/TILT failure TASS/TILT
OA Regulation decision made with best endeavours ENDVR REG
OB Delayed by signaller not applying applicable regulating policy REGULATION
OC Signaller, including wrong routing and wrong ETCS/ ERTMS instruction SIGNALLER
OD Delayed as a result of Route Control decision or directive NR CONTROL
OE Failure to lay Sandite or operate Railhead Conditioning train as programmed RHC PROG
OG Ice on conductor rail/OLE ICING
OH ARS software problem (excluding scheduling issues and technical failures) ARS
OI Formal Inquiry Incident - other operators JOINT INQ
OJ Fire in station building or on platform, affecting operators not booked to call at that station STN FIRE
OK Delay caused by Operating staff oversight, issues or absence (excluding signallers and Control) OPTG STAFF
OL Signal Box not open during booked hours BOX CLOSED
OM Technical failure associated with a Railhead Conditioning train RHC FAIL
ON Delays not properly investigated by Network Rail MIS-INVEST
OP Failure of TRUST or SMART system preventing recording and investigation of delay TRUST FLR
OQ Incorrect Simplifier SIMPLIFIER
OS Late start or delays to Railhead Conditioning Train (RHC) including any reactionary delay to other trains RHC LATE
OU Delays un-investigated UN-INVEST
OV Fire or evacuation due to fire alarm of Network Rail buildings other than stations not due to vandalism NR FIRE
OW Connections held where the prime incident causing delay to the incoming train is a FOC owned incident and service is more frequent than hourly FOC CONECT
OZ Other Network Rail Operating causes OPTG OTHER
PA TSR within Timetable Planning Rules PLANND TSR
PB Condition of asset TSR within Engineering Access Statement (EAS) PLANND COT
PD TPS cancellation (Not to be input in TSI/TRUST) TPS CANC
PE Cancelled due to planned engineering work ENGNRG WRK
PF Planned engineering work - diversion/SLW not timetabled (within Rules of the Route) DIVRSN/SLW
PG Planned cancellation by Train Operator including Bank Holiday schedules PLAND CANC
PJ Cancellation of a duplicate or erroneous schedule or associated duplicate delay DUPLICATE
PL Exclusion agreed between Network Rail and Train Operator AGREED EXC
PN VSTP service delays of 5 minutes or under caused by regulation and or time lost in running. VSTP DELAY
PT TRUST Berth Offset inaccuracies OFFSET ISS
PZ Other contractual exclusion OTH EXC
QA WTT Schedule and or LTP process including erroneous simplifiers. WTT SCHED
QB Planned engineering work - diversion/SLW not timetabled (outside the Timetable Planning Rules.) DIVRSN/SLW
QH Adhesion problems due to leaf contamination RAILCONTAM
QI Cautioning due to railhead leaf contamination CAUTCONTAM
QJ Special working for leaf-fall track circuit operation LEAVES T/C
QM Train Schedule/STP process including erroneous simplifiers STP SCHED
QN VSTP schedule / VSTP process (TSI created schedule) VSTP SCHED
QP Reactionary Delay to "P" coded Possession PLND REACT
QT Delay accepted by Network Rail as part of a commercial agreement where no substantive delay reason is identified COMMERCIAL
R1 Incorrect train dispatch by station staff DISPATCH
R2 Late TRTS given by station staff LATE TRTS
R3 Station staff unavailable - missing or uncovered STAFF MSNG
R4 Station staff split responsibility - unable to cover all duties STAFF DUTY
R5 Station staff error - e.g. wrong announcements, misdirection STAFF ERR
R7 Station delays due to special events e.g. sports fixtures SPEC EVENT
RB Passengers joining/alighting PASSENGERS
RC Pre-booked assistance for a person with reduced mobility joining/alighting BKD ASSIST
RD Attaching/detaching/shunter/watering ATT/DETACH
RE Lift/escalator defect/failure LIFT/ESC
RH Station evacuated due to fire alarm FIRE ALARM
RI Waiting connections - not authorised by TOC Control UNAUTH CON
RJ Special Stop Orders - not authorised by TOC Control UNAUTH SSO
RK Waiting passenger connections authorised by TOC but outwith TOC/Network Rail connection policy AUTH CON
RL Special Stop Orders authorised by TOC Control (including any delay at point of issue) AUTH SSO
RM Waiting connections from other transport modes XTNL CONN
RN Passengers "forcing" connections between trains outside connectional allowances PASS CONN
RO Passengers taken ill on platform PASS ILL
RP Passenger dropped object whilst boarding/alighting from train and train delayed at TOC request PASS DROP
RQ Un-booked assistance for a person with reduced mobility joining/alighting UBKD ASST
RR Loading or unloading reserved bicycles BIKE RSVD
RS Loading or unloading unreserved bicycles BIKE URSVD
RT Loading excessive luggage EXCES LUGG
RU Locating lost luggage LOST LUGG
RV Customer Information System failure PASS INFO
RW Station flooding (including issues with drains) not the result of weather, where the water has not emanated from Network Rail maintained infrastructure/network STN FLOOD
RY Mishap - Station Operator cause STN MISHAP
RZ Other Station Operator causes STN OTHER
T2 Delay at unstaffed station to non-DOO train NONDOO STN
T3 Waiting connections from other transport modes XTNL CONN
T4 Loading Supplies (including catering) SUPPLIES
TA Train-crew/loco/stock/unit diagram issues DIAG ISSUE
TB Train cancelled/delayed at Train Operator's request TOC REQEST
TC Booked Traincrew used for additional/other service CREW USED
TD Booked loco/stock/unit used for additional/other service STOCK USED
TE Injury to passenger on train PASS INJRY
TF Seat reservation problems SEAT RESVN
TG Driver TOC DRIVER
TH (Senior) Conductor/Train Manager T-MGR/COND
TI Traincrew rostering problem ROSTERING
TJ Tail lamp or headlamp missing, not lit or wrongly displayed LAMP ISSUE
TK Train catering staff (including Contractors) CATERING
TM Connection authorised by TOC but outwith connection policy AUTH CONN
TN Late presentation from the continent LATE CHUNL
TO Delay believed to be due to Operator, but no information available from Operator TOC UNEX
TP Special Stop Orders AUTH SSO
TR Train Operating Company Directive TOC DIRECT
TS Delay due to ETCS/ ERTMS on-board overriding driver command ETCS O-RDE
TT Autumn-attribution Neutral Zone delays (See Supplementary Autumn Attribution Guidance) LF NEUTRAL
TW Driver adhering to company professional driving standards or policy PRO DRIVER
TX Delays incurred on non-Network Rail running lines including London Underground causes (except T&RS) LUL CAUSES
TY Mishap-Train Operating Company cause TOC MISHAP
TZ Other Passenger Train Operating Company causes TOC OTHER
V8 Train striking bird (pheasant or smaller) SMALL BIRD
VA Disorder/drunks/trespass etc DISORDER
VB Vandalism/theft VANDALISM
VC Fatalities/injuries sustained whilst on a platform as the result of being struck by a train or falling from a train FATALITIES
VD Passenger taken ill on train ILL PASS
VE Ticket irregularities/refusals to pay TICKET IRR
VF Fire caused by vandalism VANDL FIRE
VG Police searching train POLICE-TRN
VH Communication cord or emergency train alarm operated COMM CORD
VI Security alert affecting stations and depots SEC ALERT
VR Driver adhering to company professional driving standards or policies during severe weather conditions that are not fleet related PRO DRIVER
VW Severe weather affecting passenger fleet equipment including following company standards/policies or Rule Book instructions SEV WEATHR
VX Passenger charter excludable events occurring on the LUL or other non NR running lines LUL CAUSES
VZ Other passenger or external causes the responsibility of TOC EXT OTHER
X1 Visibility in semaphore signalled areas, or special working for fog and falling snow implemented by Network Rail - in all signalling areas SPL WRKING
X2 Severe flooding beyond that which could be mitigated on Network Rail infrastructure SEV FLOOD
X3 Lightning Strike - damage to protected systems. LIGHTNING
X4 Blanket speed restriction for extreme heat or high wind in accordance with the Group Standards BLKT SPEED
X8 Animal Strike/Incursion not within the control of Network Rail EXT ANIMAL
X9 Points failure caused by severe snow where heaters are working as designed SEV SNOW
XA Trespass (Including non-intentional) TRESPASS
XB Vandalism/theft (including the placing of objects on the line) VANDALS
XC Fatalities or injuries caused by being hit by train (Including non-intentional) FATALITIES
XD Level Crossing Incidents XING INCDT
XF Police searching line POLICE-RLY
XH Severe heat affecting infrastructure the responsibility of Network Rail (excluding Heat speeds) SEV HEAT
XI Security alert affecting Network Rail Network SEC ALERT
XK External Power Supply Failure Network Rail Infrastructure EXTL POWER
XL Fire external to railway infrastructure EXTL FIRES
XM Gas/water mains/overhead power lines GAS/WATER
XN Road related - excl bridge strikes/level crossing incident ROAD INCDT
XO External trees, building or objects encroaching onto Network Rail infrastructure (not due to weather or vandalism) EXT OBJECT
XP Bridge Strike BRIDGE HIT
XQ Swing bridge open for river or canal traffic BRIDGE OPN
XR Cable vandalism or theft CABLE CUT
XT Severe cold weather affecting infrastructure the responsibility of Network Rail SEV COLD
XU Sunlight on signal or dispatch equipment SUN OBSCUR
XV Fire or evacuation due to fire alarm of Network Rail buildings due to vandalism (not including stations) VANDL FIRE
XW High winds affecting infrastructure the responsibility of Network Rail including objects on the line due to the effect of weather HIGH WIND
XZ Other external causes the responsibility of Network Rail EXT OTHER
YA Lost path - regulated for train running less late REG-ONTIME
YB Lost path - regulated for another late running train REG-LATE
YC Lost path - following train running less late FOL-ONTIME
YD Lost path - following another late running train FOL-LATE
YE Waiting to/from single line TO S/LINE
YG Regulated in accordance with Regulation Policy REG INSTRC
YI Late arrival of booked inward stock INWD STOCK
YJ Late arrival of booked Traincrew INWD CREW
YK Waiting connecting Freight or Res traffic to attach CNNCTN TFC
YL Waiting passenger connections within connections policy, contingency plan or otherwise agreed by NR/TOC AUTHSD CON
YM Special stop orders within the contingency plan or agreed by NR/TOC AUTHSD SSO
YN Service Recovery- booked train crew, not available FIND CREW
YO Waiting platform/station congestion/platform change PLATFORM
YP Delays due to diversions from booked route or line DIVERSION
YQ Passenger overcrowding caused by a train being of short formation SHRT FRMD
YR Tactical cancellation for service recovery not caused by late running SR CNCL
YT Reactionary delay to a train that is not leaving the network, by a train that is leaving the network NON NR INF
YX Passenger overcrowding caused by delay or cancellation of another train or its own late running OVER CRWD
ZW Unattributed Cancellations UNATT CANC
ZX Unexplained late start UNEX START
ZY Unexplained Station overtime UNEX OTIME
ZZ Unexplained loss in running UNEX LOSS


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