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The Integrated Electronic Control Centre (IECC) was developed in the late 1980s by the British Rail Research Division for UK-based railway signalling centres, although variations exist around the world. It is the most widely deployed VDU based signalling control system in the UK, with over 50 workstations in control centres that manage many of the most complex and busy areas of the network.^[when?]

IECC consists of a number of operator’s workstations with VDU/LCD displays which depict the control area and is semi-automatic using Automatic Route Setting (ARS) – a computer-based route setting system driven from a pre-programmed timetable database. ARS can also handle severely disrupted service patterns and assist the signaller in the event of train or infrastructure failures.

IECCs were developed as an alternative to the traditional switch or button panel control, which in turn replaced mechanical lever frames. From the start, they controlled Solid State Interlockings (SSIs), a software version of the traditional relay interlocking, but existing relay interlockings may also be controlled from an IECC. The system can control as many miles of track as required, but typically around 50–100 miles.

Recently, PC-based control systems, similar to the IECC have been developed and are sold by various signalling contractors, e.g. Westinghouse Rail Systems WESTCAD.

Early history

The concept of IECC was developed at the Railway Technical Centre in Derby during the 1980s, and in particular the initial software for ARS and SSI.

A contract for the development of an operational standard system was let in January 1987 to CAP Group, including the supply of a complete system for Yoker (Glasgow) and the ARS for the Waterloo area. This was the first time a software house became involved in railway signalling after competing against the main incumbent suppliers of GEC-General Signal and Westinghouse Signals Ltd.

The solution used off-the-shelf microcomputer technology (Motorola 68000 microprocessors and VME Bus) to host the sub-systems of IECC in high availability configurations linked via a duplicated Nine Tiles Superlink local area network. Subsequent contracts were let to CAP Group (became Sema Group in 1988) for further operational IECC systems involving the supply of turnkey hardware and software. These included the first IECC to go live at Liverpool Street in Easter 1989 quickly followed by York.^[1] In September 2020 the original Liverpool Street IECC was replaced with a new IECC Scalable system.

Later developments

As a result of UK railway privatisation in the mid-1990s, British Rail Research was bought by AEA Technology Rail, who took over the supply of new IECCs, support for the existing installed base, and enhancements to the hardware and software.^[2] In 2006, the AEA rail business became DeltaRail (now called Resonate Group), who have developed IECC Scalable which replicates all the functionality of the original IECC on a modern hardware platform and software architecture. Following a successful six-month trial at Swindon B in 2012, IECC Scalable is now the standard for new installations, starting with Cambridge where it controls the Ely-Norwich line which has been resignalled on the "modular signalling" concept for secondary routes.

List of IECCs in service as of 9 January 2024

Location	IECCs	Workstations	Area controlled	ARS?
Ashford	2	5	Southern Region SE section and High Speed 1	Yes
Cambridge	1 scalable	1	Ely to Norwich (exclusive of junctions at either end)	No
Edinburgh	5 (all scalable)	9	East Coast Main Line, from north of Berwick-upon-Tweed to south of Cupar and Fife Circle Line; also routes towards Glasgow via Falkirk, Bathgate, Shotts and Carstairs.	Yes
Harrogate	1 (Scalable)	1	Harrogate to Leeds (exclusive)	No
Liverpool Street SDC (Service Delivery Centre)	5 (all Scalable)	10	Great Eastern Main Line to Marks Tey, Bishop's Stortford/Stansted North Junction/Stansted Airport and branches	Yes
Marylebone	1 (Scalable)	2	Chiltern lines to Aynho Junction near Banbury	Yes
Thames Valley Signalling Centre	10 (all Scalable)	14 signalling 1 CCTV crossing keeper	Great Western main line from London Paddington to Bristol Parkway and Temple Meads, Swindon and branches, plus Didcot to Oxford, and Reading to Westbury (exclusive).	Yes
Upminster	3 (all Scalable)	5	London, Tilbury and Southend line and North London line	Yes
York ROC	3 (all Scalable)	7	East Coast Main Line, from north of Doncaster to north of Northallerton and Leeds area	Yes

The following installations are not true IECCs of the BR/SEMA/DeltaRail design. They are VDU based signalling control systems with a similar "look and feel" but in most cases they do not incorporate Automatic Route Setting.
Some locations shown below are interim installations which will eventually move into larger signalling control centres, such as Leamington and Madeley, which in time will move to the West Midlands Signalling Centre.

Location	Workstations	Area controlled	ARS?	Equipment
Bournemouth	1	Dorset coast	No	VICOS (Siemens SIMIS - W)
East Midlands Control Centre, Derby	5	Sharnbrook to Spondon, Attenborough to Trent East, Sheet Stores to Stenson Junction, Toton Yard, Erewash Valley Line, Pinxton Branch, Clay Cross to Tapton, Narborough - Leicester	Yes^[a]	WestCAD
Leamington Spa	1	Banbury to Warwick	No	WestCAD
Madeley (Shropshire)	1	Oxley (exclusive) to Shrewsbury (exclusive) via Telford and Wellington	No	WestCAD
Marston Vale	2	Fenny Stratford (nr. Bletchley) to Bedford St. Johns	No	GE MCS
Former Rugby Power Signal Box	1	Formerly controlled Hunsbury Hill (exclusive) to Hillmorton Junction (exclusive) via Northampton. (The WestCAD controlled the original Solid State Interlocking.) Control transferred to Rugby SCC on 3 June 2012	No	WestCAD
Rugby ROC	1	Stafford Workstation: Penkridge / Milford & Brockton - Basford Hall (exclusive)	Yes	WestCAD
Rugby Signalling Control Centre	6	West Coast Main Line between Kings Langley (exclusive) and Armitage also Three Spires Junction (exclusive) to Nuneaton, Arley Tunnel to Hinckley (exclusive) and Brandon to Rugby.	Yes	GE MCS
Wembley Mainline Suburban Workstation	1	South Hampstead to Watford Junction DC Lines	No^[b]	WestCAD
Stoke-on-Trent	3	Armitage to Crewe/Macclesfield (except Stafford station area)	No^[b]	GE MCS
Colchester PSB	6	Marks Tey - Manningtree, Colchester - Alresford, Alresford - Clacton/Walton-on-the-Naze, Westerfield - Felixstowe, Brundall - Great Yarmouth/Buckenham, Buckenham - Lowestoft + Oulton Broad South*.	Yes/No (Workstations marked with (*) do not have ARS)	GE MCS
West Midlands Signalling Centre	4	Jewellery Quarter to Warwick/Stratford-upon-Avon via Birmingham Snow Hill and Brandon/Milverton to Hampton-in-Arden/Three Spires Jn, Wolverhampton North Jn (excl.) to Bilbrook	No	WestCAD
West of Scotland ROC (WSROC)	7	Glasgow Central to Rutherglen, East Kilbride, Paisley Canal, Ayr, Largs, Wemyss Bay and Gourock	Yes	GE MCS
Port Talbot	1	Llanharan to Baglan	No	WestCAD
Abercynon	1	Abercynon to Merthyr Tydfil and Aberdare	No	WestCad 1 x SSI Interlocking
Wales ROC (WROC)	10 1 CCTV crossing keeper	Ebbw Workstation (Newport - Cardiff Long Dyke) ∞ Newport Workstation (Newport - East Usk) ∞ East Usk Workstation (East Usk - Severn Tunnel) ∞ Severn Tunnel Workstation (Severn Tunnel to Pilning and Awre) ∞ Cardiff VOG (Cardiff - Cowbridge Road and Leckwith - LLantrisant) ° Cardiff Valley (Cardiff Bay - Rhymney) ° Cardiff Main (Cardiff Long Dyke - Leckwith) ° Shrewsbury North (Shrewsbury - Gresty Lane) ∞ ¤ ៛ Port Talbot - Swansea ∞	No ∞ Yes ° ARF ៛	7 x WestCad ∞ 3 x GE MCS ° 15 x Westlock Int Remote Westrace Int ¤
East London Line Signalling Control Centre	2	Highbury & Islington station to New Cross/New Cross Gate	ARF	WestCAD
Havant	3	Portsmouth Harbour to Fareham and Rowlands Castle	No	VICOS (Siemens SIMIS - W)
Saxmundham	1	Oulton Broad South - Westerfield.	No	GE MCS
Yoker^[c]	2	Glasgow North suburban area	Yes	GE MCS
York ROC	13	Sheffield Rotherham North Lincolnshire Huddersfield Halifax Brough Hartlepool Middlesbrough Kings Cross Finsbury Park Wood Green Langley Hitchin	Yes	WestCAD

^ Nottingham, Trent & Burton Workstations now have Hitachi ICS TREsa (ARS+) commissioned.
^ ^a ^b These systems (WestCAD, Westinghouse Control and Display; GE MCS, General Electric Modular Control System) which are already in existence, are planned to be upgraded when the supplier's version of ARS has received Network Rail approval.
^ As of 2/4/2017, Yoker IECC has been converted to GE MCS with Hitachi ICS TREsa

References

^ New generation signalling control centre Beady, F.F.; Bartlett, P.J.N. Main Line Railway Electrification, 1989., International Conference
^ Signalling Control Centres Today and Tomorrow, Mitchell, I.H., IRSE Proceedings 2002-3

External links

Resonate Group Ltd web site
Hitachi Information Control Systems Europe web site
YouTube: Ashford resignalling TV News report
SimSig offers free IECC simulations for private home use
The British Power Signalling Register contains a full list of IECC and other signalling workstations (also interlockings and panels) on the UK main line Network, including those that are not listed above because they are no longer in service.