Delay Attribution Guide
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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