logoHot axle box detectors (HABDs) and wheel impact load detectors (WILDs)

A (one day) comprehensive listing

Last update 8 February 2018

Additional information is always gratefully received, whether entirely new records (particularly historical records), or information to fill in gaps or correct errors, via the contact link under the Miscellaneous entry in the navigation bar above.  Thank you.

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Sometimes, a train's axle bearings overheat.  This can cause serious damage; in an extreme case a wheel can seize and cause a derailment.  At strategic points on the network, hot axle box detectors (HABDs), also known as hot axle bearing detectors, are placed to detect overheating.  HABDs are usually placed a few miles before suitable sidings/loops such that if a fault is detected the signaller can route the train out of the way whilst inspection and repair can take place.  Detectors usually take the form of four yellow boxes, one either side of each rail.

Other easily-detectable faults are flat points on wheels.  As the wheel turns so the flat spot causes a 'hammer blow' to the track and this is detectable by wheel impact load detectors (WILDs), also known as "Gotcha", "Wheelchex" (after their proprietary names) or vehicle health monitoring equipment (VHME).  The equipment minimises the possibility of track damage.  Again these are placed shortly before a suitable place to take the train out of service as required.

These lists show HABDs and WILDs as at 2015 and subsequent developments, with additional research for earlier activity, sorted by ELR and mileage.  Names are official where known or a suitable identifying place where they aren't.

Hot axle box detectors (HABDs)

ELR HABD Name Mileage Tracks
BAG2 Spetchley 65m 17ch Down main
BAG2 Eckington 74m 51ch Up main (installed 29 September 1997, later adjusted to 74m 48ch)
74m 48ch Up main (previously at 74m 51ch)
BAG2 Ashchurch 79m 40ch Up main (removed 29 September 1997)
BAG2 Churchdown 89m 0ch Down main (present in 1969, later moved to 89m 0ch)
89m 6ch Down main (previously at 89m 0ch)
BGK Newport 39m 48ch Up main
BGK Shepreth 53m 10ch Down main
BGL2 Brookthorpe 97m 50ch Up Charfield (present in 1969, later moved to 97m 58ch)
97m 58ch Up Charfield (previously at 97m 50ch in 1969)
BHL Colthrop 48m 44ch Up Westbury, down Westbury (both later moved to 48m 66ch)
48m 66ch Up Westbury, down Westbury (both previously at 48m 44ch)
BHL Kintbury 58m 0ch Up Westbury
BHL Pewsey 75m 26ch Down Westbury (later moved to 75m 60ch)
75m 60ch Down Westbury (previously at 75m 26ch)
BRY Dinas Powys 5m 22ch Down Barry (later moved to 4m 31ch)
4m 31ch Down Barry (previously at 5m 22ch)
BRY Dinas Powys 5m 22ch Up Barry
BSW Filton Junction 4m 75ch Up Bristol
BSW Pilning 9m 8ch Up tunnel
CBC3 Low Mill 24m 27ch Down main
CCL Keinton Mandeville 120m 6ch Up
CGJ1 Winsford 166m 38ch Up main
CGJ2 Norton 176m 39ch Down main
CGJ5 Coppull Hall 10m 60ch Up main, down main
CGJ7 Hest Bank 2m 51ch Down main
CGJ7 Bolton-le-Sands 5m 8ch Up main
CGJ7 Low Gill 27m 6ch Down main
CGJ7 Harrison's Siding 41m 73ch Up main
CGJ7 Southwaite 62m 6ch Down main
CHR Barrow Hill 146m 69ch Down Barrow Hill
CHR Renishaw 152m 47ch Up main
CMD1 Harecastle 10m 58ch Up main (later moved to 14m 9ch)
14m 9ch Up main (previously at 10m 58ch)
CMD2 Barlaston 24m 47ch Down main (later moved to 24m 39ch)
24m 39ch Down main (previously at 24m 47ch)
CMP1 Holmes Chapel 166m 51ch Down Wilmslow
CMP1 Wilmslow 176m 34ch Up Wilmslow
DAC Newton St Cyres 176m 60ch Single
DBP1 Branston 13m 44ch Up Tamworth
DBP1 Willington 6m 1ch Down Tamworth
DBP1 Tamworth 22m 30ch Down main (possibly previously at 22m 40ch)
DBP3 Whitacre 31m 69ch Down slow (never installed?)
DCL Radley 58m 58ch Up main (present in 1969, later moved to 60m 0ch)
60m 0ch Up main (previously at 58m 58ch in 1969)
DCL Cropredy 89m 79ch Down main
DOL1 Castle Mills 158m 60ch Up (no longer used?)
DOW Thorne South 9m 41ch Down main (later moved to 10m 12ch)
10m 12ch Down main (previously at 9m 41ch)
DOW Keadby 17m 6ch Up main
ECA2 Auchengray 79m 35ch Up
ECM1 Langley 26m 62ch Down fast, down slow (no longer used?)
ECM1 Wymondley 29m 70ch Up slow, up fast (both later moved to 30m 60ch)
30m 60ch Up slow, up fast (both previously at 29m 70ch)
ECM1 Biggleswade 42m 10ch Up slow, up fast (no longer used?)
ECM1 Offord 54m 7ch Up fast, down fast (no longer used?)
ECM1 Abbots Ripton 64m 25ch Up fast (no longer used?)
ECM1 Holme 69m 28ch Down fast (no longer used?)
ECM1 Lolham 83m 33ch Up slow, up fast (no longer used?)
ECM1 Stoke 99m 78ch Down fast
ECM1 Barkston 109m 56ch Up main
ECM1 Balderton 116m 70ch Down main
ECM1 Cromwell 124m 55ch Up main
ECM1 Gamston (Askam) 134m 37ch Down main
ECM1 Torworth 143m 17ch Up main
ECM1 Bawtry 148m 55ch Down main (no longer used?)
ECM1 Daw Lane 159m 10ch Up main
ECM4 Earfit Lane 184m 4ch Down Leeds, down main (no longer used?)
ECM5 Sessay 16m 65ch Up fast, up slow, down fast, down slow (no longer used?)
ECM5 Danby Wiske 33m 50ch Up main (no longer used?)
ECM5 Eryholme (East Cowton) 38m 72ch Down main
ECM5 Aycliffe 49m 36ch Down main
ECM5 Littleburn (Durham) 63m 59ch Up fast
ECM5 Plawsworth (Chester-le-Street) 70m 20ch Down main
ECM7 Dam Dykes 8m 45ch Down main (removed 11 September 2017)
8m 45ch Up main
ECM7 Longhirst 20m 20ch Down main (from 11 September 2017)
ECM7 Chevington 25m 48ch Up main
ECM7 Stamford 40m 38ch Down main (removed 14 September 2017)
ECM7 Stamford 40m 38ch Up main (from 14 September 2017)
ECM7 Newham 47m 8ch Up main (removed 14 September 2017; replaced 8 February 2018)
ECM7 Goswick 60m 66ch Down main
ECM8 Stenton 25m 48ch Up (later moved to 24m 20ch)
24m 20ch Up (previously at 25m 48ch)
ECM8 Oxwellmains 32m 65ch Down
ECM8 Lamberton 54m 6ch Up main
ECN2 Aberdour 16m 31ch Up Fife circle
EMP Second Drove 75m 58ch Up Peterborough
EMP Kings Dyke 96m 71ch Down March (from 14 November 2010)
GSM1 Geddington (Corby) 77m 8ch Up and down Corby
HNL1 Tram Inn 5m 37ch Up main
HNL1 Nantyderry 28m 75ch Up main, down main
HNR Roade 59m 72ch Down Northampton
HNR Althorpe Park 72m 4ch Up Northampton
HUL1 Hemingborough (Cliffe) 28m 0ch Up Hull
HUL3 Harrymore Lane 2m 78ch Down Hull
HUL4 Barrowby Lane (Garforth) 13m 74ch Up Hull
KMG2 Floriston 7m 45ch Up arrival
KWS Post Office Lane 62m 16ch Down Doncaster
LEC1 Northchurch 30m 7ch Up slow, up fast
LEC1 Soulbury Road 42m 10ch Down slow (removed by September 2017)
LEC1 Soulbury Road 42m 74ch Down fast (removed by September 2017)
LEC1 Soulbury Road 42m 68ch Down slow, down fast (from 7 October 2017)
LEC1 Wolverton c.50m 43ch Up slow, up fast (installed by 1969)
LEC1 Castlethorpe North 55m 63ch Up slow, up fast
LEC1 Kilsby North 78m 66ch Down main (later moved to 79m 1ch)
79m 1ch Down main (previously at 78m 66ch)
LEC2 Shilton 91m 26ch Up Trent Valley slow, up Trent Valley fast
LEC2 Shilton 91m 30ch Down Trent Valley
LEC2 Armitage 121m 20ch Up Trent Valley slow, up Trent Valley fast
LEC2 Milford and Brocton 129m 29ch Down main
LEC4 Shallowford 138m 30ch Up fast, up slow
LEC4 Madeley 149m 74ch Down fast, down slow
LEN3 Long Lane (Low Gates) 46m 32ch Up (later moved to 45m 65ch)
45m 65ch Up (previously at 46m 32ch, moved to 46m 32ch by 14 October 2017)
46m 32ch Up (previously at 45m 65ch, returned to this position by 14 October 2017)
LEN3 Easington 80m 15ch Down slow, up slow (no longer used?)
LTN1 Brentwood 17m 33ch Down main; down electric
LTN1 Margaretting 25m 41ch Up main (moved to 25m 78ch after 2011)
25m 78ch Up main (previously at 25m 41ch)
MAC3 Manton Wood 60m 41ch Up main (no longer used?)
MLN1 Maidenhead 24m 3ch Up relief (from 8 September 2016, brought into use 10 April 2017)
24m 10ch Up relief (moved to 24m 3ch 8 September 2016, also present in 1969)
MLN1 Maidenhead 24m 10ch Up main (also present in 1969)
MLN1 Twyford 32m 2ch Down relief, down main (also present in 1969)
MLN1 Basildon 43m 15ch Up relief, up main (present in 1969, later moved to 43m 42ch)
48m 48ch Down relief, down main (present in 1969, later moved to 43m 42ch)
43m 42ch Up relief, up main (previously at 43m 15ch)
Down main (previously at 48m 48ch; disconnected 10 December 2016)
Down relief (previously at 48m 48ch)
MLN1 Wantage Road 61m 12ch Up main (present in 1969, later moved to 59m 57ch)
59m 57ch Up main (previously at 61m 12ch in 1969)
MLN1 Bourton 72m 65ch Down main (present in 1969, later moved to 72m 20ch)
72m 20ch Down main (previously at 72m 65ch in 1969)
MLN1 Studley (Wootton Bassett) 81m 14ch Up main (present in 1969, later moved to 81m 40ch)
81m 34ch Up main (previously at 81m 40ch to 2018)
81m 40ch Up main (previously at 81m 14ch in 1969, planned to move to 81m 34ch in 2018)
MLN1 Twerton 108m 60ch Down main
MLN1 Nailsea 127m 41ch Up main
MLN1 Yatton 131m 20ch Down main
MLN1 Cogload 158m 43ch Down main (present in 1969, later moved to 158m 70ch)
158m 70ch Down main (previously at 158m 43ch in 1969)
MLN1 Nynehead 168m 59ch Up main
MLN1 Stoke Canon 188m 56ch Down main
MLN1 Exminster 198m 70ch Up main
MLN1 Dainton tunnel 217m 57ch Up main
MLN1 Dainton tunnel 217m 57ch Down main (later moved to 217m 76ch)
217m 76ch Down main (previously at 217m 57ch)
MLN2 Keyham 248m 77ch Up main
MLN3 Treverrin 279m 59ch Up main, down main
MVL3 Heaton Lodge 29m 47ch Up Huddersfield (into use 20 January 2018)
NBS Searchlight Lane 3m 72ch Up Norton Bridge (on 2016 NBS line diversion)
NEC2 Wetherall 56m 73ch Down Newcastle
NOB1 Netherfield 2m 26ch Up Newark
NOB1 Langford 20m 24ch Up Lincoln (no longer used?)
NOC Church Fenton 11m 8ch Up Normanton (no longer used?)
NOG1 Allington 108m 64ch Up Nottingham (no longer used?)
NWO Arley 5m 60ch Down Arley
PED5 Warmsworth (Conisbrough) 19m 28ch Up Sheffield
PMJ Bainton Green 15m 33ch Up Stamford (no longer used?)
RBS1 Brandon 89m 5ch Down Coventry
RBS1 Bradnocks Marsh 101m 14ch Up main
RBS3 Penkridge 24m 1ch Down main
RBS3 Penkridge 25m 20ch Up main
SAL Warminster 113m 73ch Up Salisbury
SHL Marsh Farm 14m 33ch Down main
SHL Ludlow 26m 64ch Up main
SHL Wellington 45m 32ch Down main
SKN Lifford East 46m 0ch Up Camp Hill
SKW1 Gargrave 226m 59ch Up main
SMJ2 Hickleton 15m 12ch Down Pontefract
SMJ2 Baghill 6m 70ch Up Pontefract
SPC1 Napsbury 18m 0ch Up slow, up fast
SPC1 Chiltern Green 27m 69ch Down slow, down fast
SPC2 Oakley 53m 60ch Up slow, up fast
SPC3 Harrowden Junction (Finedon) 67m 36ch Up and down slow, down fast
SPC3 East Langton 86m 20ch Up main, down main
SPC5 Barrow-upon-Soar 108m 72ch Down slow, down fast
SPC5 Loughborough 111m 5ch Up slow, up fast
SPC8 Duffield 132m 63ch Up main (removal planned)
SPC8 Belper c134m 70ch Up main (planned to replace Duffield HABD)
SPD1 Cheal Road 48m 32ch Down Spalding
SPD2 Scopwick 70m 43ch Up Spalding
SPD2 Blankney 73m 21ch Down Spalding
SPD3 Sykes Lane 89m 17ch Up Gainsborough
SPD3 Gainsborough 98m 56ch Down main (no longer used?)
SPD4 Haxey 105m 59ch Up (no longer used?)
SPD4 Auckley 112m 73ch Down main
SWB Chipping Sodbury 105m 63ch Up Badminton, down Badminton (present in 1971)
SWB Coalpit Heath 109m 27ch Up Badminton, down Badminton
SWM2 Over? 117m 20ch Up (present in 1969)
SWM2 Bullo Pill 125m 59ch Up main
SWM2 Caldicot (Portskewett) 145m 50ch Down main
SWM2 Bishton 155m 7ch Up main, up relief
SWM2 Marshfield 163m 73ch Down main, down relief
SWM2 Pontsarn 175m 79ch Up main (later moved to at 178m 39ch)
178m 39ch Up main (previously at 175m 79ch)
SWM2 Pontsarn 178m 39ch Down main
SWM2 Bryn-Y-Gwynon 185m 10ch Up main (never installed?)
SWM2 Port Talbot West 203m 1ch Down main
SWM2 Briton Ferry 205m 36ch Up main
SWM2 Pembrey 228m 59ch Up main
SWY Urchfront 84m 28ch Up (possibly previously at 83m 40ch)
TCC Langley Mill 129m 27ch Up and down Erewash slow, up Erewash fast
TCC Stoneyford 131m 19ch Up slow, down main (never installed?)
TJC1 Dore 154m 72ch Down Sheffield (no longer used?)
TJC1 Tapton 146m 69ch Down goods (no longer used?)
TJC3 Methley North 188m 34ch Down Midland
TJC3 Calverley (Kirkstall Forge) 201m 40ch Up Leeds
TJC3 Kildwick 216m 50ch Down Shipley main
TJG2 Thorne North 14m 2ch Up main (no longer used?)
WCM1 Floriston 6m 5ch Up main
WCM1 Nethercleugh 28m 51ch Up
WCM1 Wamphray 34m 42ch Down
WCM1 Crawford 55m 76ch Up
WCM1 Leggatfoot 70m 20ch Down
WCM1 Braidwood 80m 57ch Up
WEB Tinsley's 88m 58ch Up Spalding
WEY Upton Noble (Bruton) 125m 69ch Down main
WJL1 Sutton Weaver 177m 35ch Down main
WNS Narborough 12m 17ch Up Nuneaton
XTD Sevington 58m 42ch Up main, down main (no longer used?)


Wheel impact load detectors (WILDs)

ELR WILD Name Mileage Tracks
AYR3 Howwood 12m 77ch Down Ayr, up Ayr
BAG2 Eckington 75m 46ch Down main, up main
BML1 Queenstown Road (Battersea) 2m 44ch Up main fast, up main slow
BML1 Shawford 68m 56ch Up, down
CGJ3 Dallam 183m 40ch Up slow, up fast, down fast, down slow
CMP1 Heaton Chapel 184m 27ch Up slow, up fast, down fast, down slow
ECM8 Innerwick 33m 62ch Down Berwick, up Berwick
EGM1 Philpstoun 32m 1ch Down E & G, up E & G
EMP Eastrea 93m 53ch Up, down
GSW New Cumnock 56m 70ch Down main, up main
HNL1 Tram Inn 2m 75ch Up main, down main (from 23 April 2016)
HXS3 Ainsdale 14m 18ch Down Southport
LEC1 Cheddington 34m 60ch Down fast, up fast, down slow, up slow
LTN1 Margaretting 24m 75ch Up main, down main
MAS Grindleford 159m 45ch Up main, down main
MLN1 Exminster 198m 68ch Down main, up main
MLN1 Waltham 26m 21ch Down main, up main, down relief, up relief
MLN1 Cholsey 49m 05ch Down main, up main, down relief, up relief
SHL Bromfield 25m 0ch Up main, down main (removed 23 April 2016)
SPC5 Thurmaston 101m 78ch Down fast, up fast, up and down slow
SWB Alderton 98m 30ch Up Badminton, down Badminton
SWM2 Marshfield 163m 63ch Down main, up main, down relief, up relief
TRL3 Thurrock 29.723km Down CTRL
TRL3 Thurrock 29.739km Up CTRL
TRL3 Nashenden 52.864km Down CTRL
TRL3 Nashenden 52.995km Up CTRL
TRL3 Charing 79.731km Up CTRL
TRL3 Charing 79.822km Down CTRL
TRL3 Ashford 92.771km Down CTRL, up CTRL
VIR Swanley 16m 8ch Up fast, up slow
WCM1 Braidwood 80m 58ch Down main, up main
XTD Sevington 58m 42ch Up main, down main

Please select a feature list from the links below:

HABD and WILD | OLE neutral sections | Water troughs | Telegraphic codes | Buzzer codes