List of Train Describers

The following list of train describers was last updated on 20th May 2022.

Specific information relating to each TD (such as ECSs/SOPs which give the S-Class data mapping, Block schematics which show all the berth steps within a TD and stepping tables which show which conditions must be met in order for description to step) can be found by clicking on the link in the 'ID' column.

User contributed maps, where available, show signal berths and their locations in relation to the railway. Because maps have been compiled using steps seen from the feed, the placement of berths may not be accurate in all locations.

General information relating to entire signalling areas can be found by clicking the link in the 'topic' column. This may include track and signalling maps released by Network Rail.

The column headings are as follows:

• ID - identity of the train describer in TD messages. This is not necessarily the same as the plated signalbox ID. Where a link is provided you will find specific details relating to that TD area.
• Name - the name of the train describer
• Topic - the name of the topic - if unspecified, data is available on the 'all area' feed. Where a link is provided you will find generic details relating to that area.
• SIG - whether signal aspects (on/off) are available
• RTE - whether route set indications are available
• TRS - whether Train Ready To Start (TRTS) indications are available
• TRK - whether track occupation (track circuit or axle counter) indications are available
• PTS - whether points (normal/reverse) indications are available
• LXG - whether level crossing barrier control indications are available
• Commissioning - the date the train describer was commissioned or when it is expected (day/month/year).

A TD with the name of 'TBD' indicates a train describer which is planned, but details are not yet available. A '?' in one of the six S-Class columns indicates that this detail is not currently known. A Commissioning date marked * refers to the first messages in the feed, and may not relate to live signalling.

Train Describers

Current and Planned

ID	Name	Topic	SIG	RTE	TRS	TRK	PTS	LXG	Commissioning
A2	Ashford IECC B	TD_KENT_MCC_SIG_AREA	✔	✔	✔
A3	Ashford Front-End TD	TD_KENT_MCC_SIG_AREA	✔	✔
AD	Ashford IECC A	TD_KENT_MCC_SIG_AREA	✔	✔	✔
AL	Alnmouth SB TD	TBC (LNE_NE)	✔	✔		✔
AN	Allington Junction	TD_MC_EM_SIG_AREA	✔
AS	Aston SCC TD	TD_LNW_WMC_SIG_AREA	✔	✔	✔
AW	Acton Wells	TD_ANG_SIG_AREA	✔	✔			✔
B1	BAROC Strawberry Hill Scalable	TBD	✔	✔	✔	✔			30/03/2021*
B2	BAROC Ascot Scalable	TBD	✔	✔	✔	✔			30/03/2022*
BA	Barnsley PSB TD	TBC (LNE_NE)	✔			✔	✔		11/04/2021* (S-Class enabling)
BE	Basingstoke	TD_WESS_SIG_AREA	✔	✔	✔	✔
BG	WMSC Bromsgrove Corridor WestCAD	TBD	✔	✔					07/11/2016
BL	Bristol PSB ITD	TD_WWC_SIG_AREA
BM	Barnham DTD	TD_SUSS_SIG_AREA	✔	✔	✔			✔
BN	Birmingham New Street PSB	TD_LNW_WMC_SIG_AREA							Planned decommissioning 26/12/2022
BP	Basingstoke (Poole - Wool)	TD_WESS_SIG_AREA	✔	✔			✔
BS	Barnes TD	TD_WESS_SIG_AREA	✔	✔		✔
BU	EMCC Burton Area WestCAD	TBD	✔	✔				✔	17/08/2018*
BX	Basingstoke (WoE)	TD_WESS_SIG_AREA	✔	✔	✔	✔
C0	TfW CVLICC TAM Area WestCAD	TBD	?	?	?	?	?	?	Planned 2022-10-31
C1	SWCC Newport Corridor WestCAD	TD_WWM_SIG_AREA	✔	✔	✔
C2	SWCC Cardiff Area MCS	TD_WWM_SIG_AREA	✔	✔	✔	✔	✔
C3	SWCC Shrewsbury North WestCAD	TD_WWM_SIG_AREA	✔	✔
C5	WROC North Wales Coast WestCAD	TBD	✔	✔					09/03/2018*
C6	SWCC Swansea Area WestCAD	TBD	✔	✔		✔			26/02/2019*
CA	Cambridge ITD	TD_ANG_SIG_AREA	✔	✔		✔	✔
CC	Colchester	TD_ANG_SIG_AREA	✔	✔		✔	✔
CD	Castleford	TBC (LNE_NE)	✔			✔	✔		04/04/2021* (S-Class enabling)
CE	Crewe PSB	TD_LNW_C_SIG_AREA	✔	✔	✔
CH	Chichester	TD_SUSS_SIG_AREA		✔	✔
CL	Carlisle PSB TD	TD_LNW_LC_SIG_AREA
CS	Chester PSB	TD_LNW_C_SIG_AREA
CT	Channel Tunnel	TD_KENT_MCC_SIG_AREA	✔
CV	WMSC Cherwell Valley WestCAD	TD_LNW_WMC_SIG_AREA	✔	✔					08/08/2016
CY	WMSC Coventry WestCAD	TD_LNW_WMC_SIG_AREA	✔	✔	✔
D0	TVSC Bristol Temple Meads Area Scalable IECC	TBD	✔	✔	✔	✔			29/03/2018*
D1	TVSC Reading IECC A	TD_WTV_SIG_AREA	✔	✔	✔	✔
D2	TVSC Reading IECC B	TD_WTV_SIG_AREA	✔	✔	✔	✔
D3	TVSC Paddington Area Scalable IECC	TD_WTV_SIG_AREA	✔	✔	✔	✔
D4	TVSC Hayes Area Scalable IECC	TD_WTV_SIG_AREA	✔	✔	✔	✔
D5	TVSC Didcot IECC	TD_WWC_SIG_AREA	✔	✔	✔	✔
D6	TVSC Maidenhead Area Scalable IECC	TD_WTV_SIG_AREA	✔	✔		✔
D7	TVSC Swindon Area IECC	TD_WWC_SIG_AREA	✔	✔		✔
D9	TVSC Stoke Gifford IECC	TD_WTV_SIG_AREA	✔	✔		✔			30/08/2016
DA	TVSC Acton Area Scalable IECC	TBD	✔	✔	✔	✔			2021-12-21*
DR	Doncaster PSB TD	TD_LNE_GN_SIG_AREA
DU	Dundee TD	TBD							29/09/2021*
DY	EMCC Derby Area WestCAD	TBD	✔	✔	✔	✔			03/09/2018
E1	Edgeley No 1	TD_LNW_C_SIG_AREA		✔
EA	Edinburgh SCC IECC "A"	TD_SE_SIG_AREA	✔	✔	✔				Planned renaming to EE 2022-10 - 2022-11
EA	Edinburgh SCC IECC "A" (Scalable)	TBC	✔	✔	✔	✔			Planned 2022-10 - 2022-11
EB	Edinburgh SCC IECC "B"	TD_SE_SIG_AREA	✔	✔	✔	✔			Planned decommissioning 2023-02 - 2023-05
EB	Edinburgh SCC IECC "B" (Scalable)	TBC	✔	✔	✔	✔		✔	Planned 2023-02 - 2023-05
EC	Edinburgh SCC IECC "C"	TD_SE_SIG_AREA	✔	✔	✔	✔
ED	Edinburgh SCC IECC "D" (Scalable)	TD_SE_SIG_AREA	✔	✔	✔	✔
EE	Edinburgh SCC IECC "E"	TBD	✔	✔	✔				Planned 2022-10 - 2022-11
EH	Eastleigh	TD_WESS_SIG_AREA	✔	✔	✔	✔	✔	✔
EK	East Kent MCS ITD	TD_KENT_MCC_SIG_AREA	✔	✔	✔	✔	✔	✔
EN	Cambridge IECC (Ely - Norwich)	TD_ANG_SIG_AREA	✔	✔		✔		✔
EX	Exeter	TD_WWC_SIG_AREA		✔
FE	Ferrybridge	TD_LNE_GN_SIG_AREA	✔	✔			✔
FH	Feltham ASC TD	TD_WESS_SIG_AREA		✔					Planned decommissioning 2023-08
G1	WSSC Glasgow Area WestCAD	TD_SW_SIG_AREA	✔	✔	✔		✔
G2	WSSC Paisley ITD	TD_SW_SIG_AREA	✔	✔	✔	✔	✔
G3	WSSC Newton/Whifflet Area WestCAD	TBD	✔	✔		✔			18/04/2017
G4	WSSC Motherwell/Carstairs Area WestCAD	TBD	✔	✔		✔			16/08/2018*
GD	Guildford	TD_WESS_SIG_AREA
GL	Gloucester ITD	TD_WWC_SIG_AREA
HG	Harrogate IECC	TD_LNE_NE_SIG_AREA	✔	✔			✔	✔
HN	Heaton Norris	TD_LNW_C_SIG_AREA		✔
HT	Havant	TD_WESS_SIG_AREA	✔	✔	✔
IH	Inverness Highlands WestCAD	TBD	✔	✔		✔			05/12/2017*
IR	Inverness RETB	TBD	?	?	?	?	?	?	Planned 2022-08 (provisional)
KG	EMCC Kettering Area WestCAD	TBD	✔	✔	✔				21/02/2018*
KM	EXROC Mid-Cornwall Workstation	TBD	?	?	?	?	?	?	Planned 2023-11
KN	WMSC Kings Norton WestCAD	TBD	✔	✔					07/11/2016
L1	Lincoln West	TBD	?	?	?	?	?	?	Planned 2023-06-01 to 2023-08-31
L2	Lincoln East	TD_MC_EM_SIG_AREA	✔	✔
LA	Lancing	TD_SUSS_SIG_AREA		✔
LC	WMSC Leamington Corridor	TD_LNW_WMC_SIG_AREA	✔	✔	✔
LN	Lincoln	TD_MC_EM_SIG_AREA	✔	✔	✔				Planned decommissioning 2023-06-01 to 2023-08-31
LR	EMCC Leicester Area WestCAD	TD_MC_EM_SIG_AREA	✔	✔	✔	✔
M0	MRROC Lime Street WestCAD	TBD	✔	✔	✔				26/07/2018*
M1	MRROC Liverpool Area WestCAD	TD_LNW_C_SIG_AREA	✔	✔
M2	MRROC Manchester North WestCAD	TD_LNW_C_SIG_AREA	✔	✔
M3	MRROC Manchester Central WestCAD	TD_LNW_C_SIG_AREA	✔	✔	✔
M4	MRROC Wavertree (East) WestCAD	TBD	✔	✔					07/05/2018*
M5	MRROC Wavertree (West) WestCAD	TBD	✔	✔					19/12/2018*
M6	MRROC Macclesfield Area WestCAD	TBD	?	?	?	?	?	?	Planned 30/08/2022
M9	MRROC Blackpool Area WestCAD	TBD	✔	✔					29/01/2018
MA	Maidstone East	TD_KENT_MCC_SIG_AREA		✔
MD	EMCC Mansfield	TD_MC_EM_SIG_AREA	✔	✔	✔
ME	Marylebone Chilterns IECC	TD_LNW_WMC_SIG_AREA	✔	✔	✔	✔
MH	Machynlleth	TD_WWM_SIG_AREA	✔	✔	✔
MO	Morpeth SB TD	TBC (LNE_NE)	✔	✔		✔
MP	Manchester Piccadilly PSB TD	TD_LNW_C_SIG_AREA	✔	✔	✔	✔
MS	Manchester South	TD_LNW_C_SIG_AREA		✔	✔
MZ	Manchester East WestCAD	TD_LNW_C_SIG_AREA	✔	✔		✔	✔
NE	EMCC North Erewash Area WestCAD	TD_MC_EM_SIG_AREA	✔	✔
NJ	Neasden Jn TD	TBD	?	?	?	?	?	?	2016
NK	Ashford North Kent MCS	TD_KENT_MCC_SIG_AREA	✔	✔	✔	✔	✔
NL	Colchester NYL Area MCS	TBD	✔	✔	✔	✔	✔		04/02/2020*
NM	EMCC Nottingham WestCAD	TD_MC_EM_SIG_AREA	✔	✔	✔
NS	WMSC New Street Station WestCAD	TBD	?	?	?	?	?	?	Planned 26/12/2022
NX	East London Line	TD_ANG_SIG_AREA	?	?	?	?	?	?
PB	Peterborough	TD_LNE_GN_SIG_AREA
PH	Plymouth	TD_WWC_SIG_AREA
PJ	WMSC Proof House Jn WestCAD	TBD	✔	✔					17/12/2017*
PT	Port Talbot	TD_WWM_SIG_AREA
PX	Preston PSB TD	TD_LNW_LC_SIG_AREA
Q0	ROROC Crossrail RCC (Core)	TBD	✔	✔		✔	✔		14/02/2019*
Q1	ROROC Stratford IECC	TBD	✔	✔	✔	✔			06/11/2016
Q2	ROROC Shenfield IECC	TBD	✔	✔	✔	✔			26/02/2017
Q3	ROROC West Anglia Area IECC	TBD	✔	✔	✔	✔		✔	08/03/2019*
Q4	ROROC Liverpool Street Area IECC	TBD	✔	✔	✔	✔			13/09/2020*
Q5	ROROC LT&S (Main) Area IECC	TBD	✔	✔	✔	✔		✔	27/09/2020
Q6	ROROC LT&S (Loop) Area IECC	TBD	✔	✔	✔	✔			27/09/2020
R1	Rugby SCC (Watford - Bletchley ITD)	TD_WCS_SIG_AREA	✔	✔	✔	✔	✔
R2	Rugby SCC (Northampton - Rugby ITD)	TD_WCS_SIG_AREA	✔	✔	✔	✔	✔
R3	RYROC Stafford Area WestCAD	TBD	✔	✔					01/09/2015
RA	Radyr	TD_WWM_SIG_AREA							Planned decommissioning 2022-10-07
RT	Marston Vale MCS	TD_WCS_SIG_AREA	✔	✔		✔	✔	✔
RW	Rochdale West	TD_LNW_C_SIG_AREA	✔	✔	✔
SC	Scunthorpe	TD_LNE_GN_SIG_AREA
SJ	WMSC Stourbridge WestCAD	TD_LNW_WMC_SIG_AREA	✔	✔	✔
SK	Stoke On Trent	TD_LNW_C_SIG_AREA	✔	✔	✔	✔	✔
SM	Stirling Middle	TD_SE_SIG_AREA	✔	✔
SO	South Tottenham	TD_ANG_SIG_AREA
SS	Sandhills Area WestCAD	TBC (LNW_C)	✔	✔					2022-03-27
SU	Surbiton (Woking)	TD_WESS_SIG_AREA	✔	✔
SV	WMSC Stour Valley WestCAD	TBD	✔	✔					17/12/2017*
SX	Saxmundham (East Suffolk) MCS	TD_ANG_SIG_AREA	✔	✔		✔	✔
T1	TYROC Newcastle/Gateshead Area WestCAD	TD_LNE_NE_SIG_AREA	✔	✔	✔	✔			2021-12-25*
T2	TYROC Darlington Area WestCAD	TD_LNE_NE_SIG_AREA	✔	✔	✔	✔			2021-12-25*
T3	TYROC Sunderland Area WestCAD	TBD	✔	✔		✔			2021-12-25*
TB	Three Bridges ASC ITD	TD_SUSS_SIG_AREA		✔	✔
TD	WMSC Telford	TD_LNW_WMC_SIG_AREA	✔	✔	✔
TE	Tonbridge	TD_KENT_MCC_SIG_AREA	✔	✔
TH	Thrumpton	TD_LNE_GN_SIG_AREA	✔	✔
TN	EMCC Chesterfield Area WestCAD	TD_MC_EM_SIG_AREA	✔	✔		✔
TW	Tweedmouth SB TD	TBC (LNE_NE)	✔	✔		✔
U3	Upminster 3 IECC	TD_ANG_SIG_AREA	✔	✔	✔	✔
VC	London Victoria	TD_SUSS_SIG_AREA		✔	✔
W2	Woking (Farnham)	TD_WESS_SIG_AREA	✔	✔	✔
WA	Warrington PSB	TD_LNW_C_SIG_AREA	✔	✔
WC	Wembley C Sidings								07/06/2015
WD	Winsford PSB	TD_LNW_C_SIG_AREA
WE	Worksop	TD_LNE_GN_SIG_AREA	✔
WH	West Hampstead PSB	TD_MC_EM_SIG_AREA
WI	Wimbledon NCP	TD_WESS_SIG_AREA	✔	✔	✔
WJ	Wembley Mainline (Watford) WestCAD	TD_WCS_SIG_AREA	✔	✔
WK	Wakefield Kirkgate	TD_LNE_NE_SIG_AREA
WL	WMSC Walsall WestCAD	TBD	✔	✔	✔
WN	WMSC Water Orton WestCAD	TD_LNW_WMC_SIG_AREA	✔	✔
WO	WMSC Wolverhampton WestCAD	TD_LNW_WMC_SIG_AREA	✔	✔
WS	Willesden Suburban	TD_WCS_SIG_AREA	✔	✔	✔	✔	✔
WW	Westbury	TD_WWC_SIG_AREA		✔
WY	Wembley Mainline PSB	TD_WCS_SIG_AREA	✔	✔		✔
X0	TBROC Thameslink Core WestCAD	TD_SUSS_SIG_AREA	✔	✔	✔	✔			15/03/2015
X1	TBROC London Bridge Central WestCAD	TD_SUSS_SIG_AREA	✔	✔	✔	✔			05/01/2015
X2	TBROC Charing Cross WestCAD	TBD	✔	✔	✔	✔			04/01/2016
X3	TBROC Cannon Street WestCAD	TBD	✔	✔	✔	✔			30/08/2016
X5	TBROC Sutton Area WestCAD	TBD	✔	✔	✔	✔			09/03/2018*
X6	TBROC Streatham Area WestCAD	TBD	✔	✔		✔			03/05/2016
X7	TBROC East Sussex MCS	TBD	✔	✔		✔	✔	✔	02/12/2019*
XB	Macclesfield	TD_LNW_C_SIG_AREA							Planned decommissioning 30/08/2022
XE	Warrington Central	TD_LNW_C_SIG_AREA
XL	Hunts Cross	TD_LNW_C_SIG_AREA
Y0	YKROC North Lincs WestCAD	TBD	✔	✔	✔	✔			30/12/2015
Y1	YKROC York Area IECC	TBD	✔	✔	✔	✔		✔	25/12/2018*
Y2	YKROC Leeds City Area IECC	TBC (LNE_NE)	✔	✔	✔	✔			25/12/2018*
Y3	YKROC Leeds North West Area IECC	TBC (LNE_NE)	✔	✔	✔	✔			25/12/2018*
Y4	YKROC Sheffield WestCAD	TBD	✔	✔	✔	✔			02/05/2016
Y5	YKROC Brough WestCAD	TBD	✔	✔					07/11/2018*
Y6	YKROC Huddersfield WestCAD	TBD	✔	✔	✔	✔			18/01/2018*
Y7	YKROC Halifax WestCAD	TBD	✔	✔	✔	✔			17/10/2018*
Y8	YKROC Kings Cross North WestCAD	TBD	✔	✔	✔				26/11/2018*
Y9	YKROC Kings Cross South WestCAD	TBD	✔	✔	✔				14/04/2021*
YA	YKROC Hartlepool Area WestCAD	TBD	✔	✔	✔	✔			07/02/2021
YB	YKROC Middlesbrough Area WestCAD	TBD	✔	✔	✔	✔	1		2021-11-15*
YO	Yoker SCC MCS	TD_SW_SIG_AREA	✔	✔	✔	✔	✔
ZA	Ashford TDC	TD_KENT_MCC_SIG_AREA
ZB	Bournemouth TDC	TD_WESS_SIG_AREA		✔
ZG	Guildford TDC	TD_WESS_SIG_AREA	✔	✔
ZH	Horsham TDC	TD_SUSS_SIG_AREA
ZR	Rainham TDC	TD_KENT_MCC_SIG_AREA
ZY	Yeovil TDC - Salisbury & Exmouth Jn	TD_WESS_SIG_AREA	✔	✔	?	✔	✔

Decommissioned

ID	Name	Topic	SIG	RTE	TRS	TRK	PTS	LXG	Abolished
BD	Bowesfield	TD_LNE_NE_SIG_AREA	✔	✔					09/03/2019
CF	Cardiff	TD_WWM_SIG_AREA							30/12/2015
CM	Carmuirs East	TD_SE_SIG_AREA	✔	✔		✔	✔		~26/12/2017
DN	(Not commissioned)
DY	Derby	TD_MC_EM_SIG_AREA	✔	✔					01/09/2018
ES	TBROC East Sussex MCS	TD_SUSS_SIG_AREA	✔	✔	✔	✔	✔	✔	02/12/2019
F2	Feltham (Shepperton Branch) IECC	TBD	✔	✔		✔			02/04/2021 (commissioned 23/06/2019)
HM	Healey Mills	TD_LNE_NE_SIG_AREA	✔	✔	✔		✔		~22/01/2018
HU	Huddersfield	TD_LNE_NE_SIG_AREA							~22/01/2018
K2	Kings Cross (Hertford Loop)	TD_LNE_GN_SIG_AREA	✔	✔			✔		02/12/2018
KX	Kings Cross	TD_LNE_GN_SIG_AREA							24/03/2022
LB	London Bridge ASC TD	TD_KENT_MCC_SIG_AREA		✔	✔				25/07/2020
LE	Leamington Spa	TD_LNW_WMC_SIG_AREA							07/08/2016
LS	Liverpool Street IECC "A"	TD_ANG_SIG_AREA	✔	✔	✔	✔			13/09/2020
ML	Motherwell PSB TD	TD_SW_SIG_AREA	✔	✔	✔				25/12/2019
NT	Newport PSB	TD_WWM_SIG_AREA							29/10/2012
OX	Oxford PSB	TD_WWC_SIG_AREA							07/07/2018
SA	Saltley	TD_LNW_WMC_SIG_AREA							07/11/2016
SD	Sheffield	TD_LNE_GN_SIG_AREA							02/05/2016
SE	Shenfield IECC (Liverpool Street IECC "C")	TD_ANG_SIG_AREA	✔	✔	✔				26/02/2017
SH	Slough A	TD_WTV_SIG_AREA		✔					07/04/2015
SI	Stratford IECC (Liverpool Street IECC "B")	TD_ANG_SIG_AREA	✔	✔	✔				06/11/2016
SN	Swindon A ITD	TD_WWC_SIG_AREA							21/02/2016
SS	Merseyrail IECC	TD_LNW_C_SIG_AREA	✔	✔	✔	✔			2022-03-27
T1	Tyneside 1 IECC	TD_LNE_NE_SIG_AREA	✔	✔	✔				2021-12-25
T2	Tyneside 2 IECC	TD_LNE_NE_SIG_AREA	✔	✔	✔				2021-12-25
TY	Tees Yard (Ryhope)	TD_LNE_NE_SIG_AREA	✔	✔	✔				07/02/2021
UR	Upminster "A" IECC	TD_ANG_SIG_AREA	✔	✔	✔	✔			27/09/2020
U2	Upminster "B" IECC	TD_ANG_SIG_AREA	✔	✔	✔	✔			27/09/2020
VT	Thameslink South	TD_SUSS_SIG_AREA	✔	✔	✔				15/03/2015
WG	West Anglia IECC (Liverpool Street IECC "D")	TD_ANG_SIG_AREA							09/03/2019
WT	Thameslink North	TD_MC_EM_SIG_AREA	✔	✔	✔				15/03/2015
XH	Stafford No 4	TD_LNW_C_SIG_AREA							01/09/2015
XJ	Stafford No 5	TD_LNW_C_SIG_AREA							01/09/2015
XP	Manchester North	?							07/04/2015
XZ	Liverpool Lime Street	TD_LNW_C_SIG_AREA							29/07/2018
Y2	York IECC 2 (Leeds City)	TD_LNE_NE_SIG_AREA	✔	✔	✔				25/12/2018
Y3	York IECC 3 (Leeds North West)	TD_LNE_NE_SIG_AREA	✔	✔	✔				25/12/2018
YK	York IECC	TD_LNE_NE_SIG_AREA							25/12/2018
YZ	YKROC Bowesfield Area WestCAD	TBD	✔	✔	?	?	?	?	2021-11-15
ZE	Eastbourne TDC	TD_SUSS_SIG_AREA							29/11/2019

Abbreviations

Code	Meaning
ASC	Area Signalling Centre
DTD	Dual Train Describer
IECC	Integrated Electronic Control Centre
ITD	Information Train Describer
MCS	Modular Control System
NCP	Network Control Processor
PSB	Power Signal Box
RCC	Route Control Centre
ROC	Rail Operating Centre
SB	Signal Box
SCC	Signalling Control Centre
TDC	Train Describer Concentrator
BAROC	Basingstoke ROC
CVLICC TAM	Core Valley Lines Integrated Control Centre - Treherbert, Aberdare, and Merthyr
EMCC	East Midlands Control Centre
EXROC	Exeter ROC
MRROC	Manchester ROC
ROROC	Romford ROC
RYROC	Rugby ROC
SWCC/WROC	South Wales Control Centre/Wales ROC
TBROC	Three Bridges ROC
TVSC	Thames Valley Signalling Centre
TYROC	Tyneside ROC
WMSC	West Midlands Signalling Centre
WSSC	West of Scotland Signalling Centre
YKROC	York ROC