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Danny Scroggins & Luke Cartey


British Power Signalling Register

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Version Updates



Version 17.1, 3 January 2017
  1. Register brought up to date with alterations and additions to current infrastructure since last issue.


Version 16.1, 24 February 2016
  1. Register brought up to date with alterations and additions to current infrastructure since last issue.
  2. Interlockings provided only for the control of automatic level crossings and protecting signals (such as AHB with stopping / non-stopping controls, MCB-OD etc) are now excluded as they are considered to operate automatically and not be controlled by the supervising signal box.


Version 15.1, 03 March 2015
  1. Where actual commissioning or decommissioning dates are shown which are known to differ from dates shown in official or other reputable publications these are now flagged up in the Notes column to assist the user to avoid suspicion of an error
  2. Various minor corrections to existing entries, along with new historical entries, have been included following access to large numbers new Weekly Operating Notices and Signalling Notices.
  3. Register brought up to date with alterations and additions to current infrastructure since last issue.


Version 14.1, 04 February 2014
  1. The main amendments with this version centre around extensive and time-consuming research undertaken to into early power frame installations. Many long-standing dates have been refined and corrected as a result of research concentrating on a re-evaluation of primary source material (mainly at the National Archives).
  2. Various minor corrections to existing entries, along with new historical entries, have been included following access to large numbers new Weekly Operating Notices and Signalling Notices.
  3. Register brought up to date with alterations and additions to current infrastructure since last issue.


Version 13.1, 01 June 2013
  1. Power frames, whilst continuing to be in a separate section, are no longer considered to be an appendix to the main Register, reflecting the comprehensive listing they now enjoy from continued research.
  2. Statutory standard gauge minor railways are now included.


Version 12.1, 14th October 2012
  1. A considerable amount of further research has taken place since Version 11.2 with appropriate corrections to Excel spreadsheet entries. Many new interfaces / interlocking have been discoverd along with some additional interlockings controlled by already listed interfaces. Much further research has been done into power frames with MT6 and MT29, especially single slide / lever applications in connection with ERS on the LNER, leading to many new entries.
  2. Developments in Westinghouse M5 panels reviewed in light of discovery that Westbury and Exeter panels consist of later Unipart Rail tiles.
  3. Official Westinghouse photo of Berwick LCP shows the operation to be IFS[+] - text relating to MCD panels amended.
  4. Central Interlocking Processor (CIP) capitalised identity codenames now given for Smartlock and Westlock etc. CBIs as they are now shown in SSI 8150E registers etc. Virtual interlocking codenames (VIXLs) are no longer shown as it has been pointed out that VIXLs are merely a feature of the software and are not a hardware feature, so have no place in a hardware-based listing.


Version 11.2, 26th October 2011
  1. IFS[-] and ERS[-] consisting of individual switches of proprietary make, which have undergone no adaptation for signalling use, now shown as 'Generic Switch' in Make & Model column. This mainly affects some entries previously attributed to BR(WR) in other versions. Entries previously shown as 'Domestic Light Switch' are also shown by new nomenclature. BR(SR) interfaces of Square-D components unaffected, as these were built up from base components for specific locations.
  2. Farningham Road IFS[-] identified as SGE, with consequent alteration for text relating to Westinghouse.
  3. Westinghouse Westpac MkIVA interlocking found to have been introduced in 1976, not 1979, for the Doncaster PSB scheme.
  4. Interlocking types R and RRI combined into one new category - Relay Interlocking (RI) - owing to the discovery that differentiation between these designs based on the presence or not of route-relay circuitry is not sound. Certain electronic replacements for non-vital relay circuitry can be made to an otherwise accepted route-relay interlocking.
  5. 1961 SGE geographical interlockings at Gas Factory Jcn and Stepney East acknowledged as the first geographical relay interlockings commissioned in the UK.
  6. Goole Bridge IFS[+] in NRM discovered to be a much later BR(ER) replacement in the original console shell. The history of early Westinghouse panel styles revised to reflect the appearance of the true original.
  7. All former interlockings converted to relay rooms listed as decommissioned on date of conversion, irrespective of any continuing remote link (TDM / FDM etc.)
  8. Signalling associated with Depot Protection Systems excluded
  9. (KS) - key switch - designation extended to cover the small number of IFS and MPK interfaces which utilise this style of operation


Version 11.1, 15th April 2011
  1. 1959 is year when AEI supercedes MV, not 1960. Manufacturer / Design names in spreadsheets amended to reflect.
  2. Definition of 'manufacturer' excludes firms sub-contracted to produce interfaces to another company's design, in light of discovery of this practice in both the power frame and panel eras.
  3. NRS interfaces to BR(ER) designs shown as such.
  4. KCI IFS[-] now understood to have been designed and introduced by GWR. New text entry for GWR and later BR(WR) produced KCI credited to GWR design.
  5. Description of unique Henry Williams NX(PP)[+] at York Yard South altered subsequent to colour photos of panel coming to light.
  6. Definition of interface now makes clear that MCB release and wicket gate controls are not included - this affects Beverley and Onibury boxes which are not now shown Hybrid.
  7. Several Frame Hybrid interfaces now have additional entry for when frame later removed or only retained to work equipment not valid for inclusion as an interface.
  8. Several entries for NE interfaces firmed up following access to photos by the late John Boyes. These photos also reveal a Westinghouse M1 IFS[+] at Redcar Ore Terminal BSC in 1973, the latest M1 discovered and revealing a overlap period with M3 production; and a Henry Williams Integra Domino IFS[+] at Redcar Mineral Terminal BSC in 1976 - so Goole Swing Bridge in 2007 was not the first of this type for that company.
  9. Definition of relay interlockings amended in light of information that some small remote interlockings of this type are operated by IFS-style controls on route-setting interfaces.
  10. Westinghouse Style A PF(L) have horizontal locking. Vertical locking introduced with the Style B.
  11. TIF names no longer used to identify Westlock CBI; CIP name used instead.
  12. More IECC operating system hardware designers identified.
  13. MV-GRS traded as GRS 1930 - 1942, relevant interface manufacturer names amended.
  14. Further information on Whitemoor Hump interfaces operation.
  15. GRS frame types and operation clarified from company catalogue - no Type B known.
  16. Contelec Engravings Ltd identified as supplying interfaces which are very similar to TEW products.
  17. MV-GRS individual PF(S) identified.


Version 10.3, 3rd November 2010
  1. New glossary added.
  2. Minor clarifications of definitions.
  3. Extra photographs, particularly of PF.
  4. GETS MCS and Westinghouse Westcad manuals found to be in error in detailing ARS facilities. ARS now understood to be a tradename specific to IECC systems. Normal Operation of WS systems amended to reflect and connected changes to manufacturers' text. Changes to text descriptions of automatic route setting facilities.
  5. CBI spreadsheet entries now show virtual interlocking names for Westlock and Smartlock as given in National SSI Register SSI 8150E
  6. Minor corrections to spreadsheets and numerous additional entries.


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