Interlockings: Difference between revisions

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(Minety and Kemble closure date added)
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| [[Hullavington]] || S.313 || BR(WR) E10k Freewired || 23 March 1968<ref name="BPSR" /> || Extant   
| [[Hullavington]] || S.313 || BR(WR) E10k Freewired || 23 March 1968<ref name="BPSR" /> || Extant   
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| [[Kemble]] || S.332 || BR(WR) E10k Freewired || 27 July 1968<ref>K2 Week 30 1968</ref> || 18 August 2014
| [[Kemble]] || S.332 || BR(WR) E10k Freewired || 27 July 1968<ref>K2 Week 30 1968</ref> || 0108 19 August 2014<ref>Swindon Panel Occurrence Book</ref>
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Revision as of 09:47, 19 August 2014

The interlockings controlled by Swindon Panel have a standard circuitry design known as BR(WR) E10k, derived from the reference number of the series of drawings describing this design (E10000 series). It is a freewired interlocking design (Western Region never used geographical interlockings). The term 'freewired' means that all of the interlocking is bespoke to its particular location, consisting of individual relays wired together to suit that particular application. By contrast, a geographical interlocking consists of pre-wired generic packs of relays which are combined together like building blocks to build up the interlocking. Geographical interlockings are quicker to install and require less on-site testing but as not all of the available functions in each relay pack may be required there can be considerable redundancy. The wasted expenditure of this redundancy and the higher initial cost of pre-packaged units has to be balanced against the savings in installation and testing costs. Western Region decided that, in their opinion, freewired interlockings provided better value for money.

The first E10k interlocking was installed at West Ealing in 1955. The panel at West Ealing was supplied by MV-GRS to their standard NX Turn-Push design and the E10k interlocking system was influenced by MV-GRS interlocking practice.

The table below shows the interlockings in the Swindon Panel area:

Interlocking Site Code Type Commissioned De-commissioned
Uffington S.277 BR(WR) E10k Freewired 30 May 1965[1] Extant
Bourton S.280 BR(WR) E10k Freewired 01 October 1977[1] Extant
South Marston S.282 BR(WR) E10k Freewired 11 June 2000[1] Extant
Highworth S.283 BR(WR) E10k Freewired 03 March 1968[1] Extant
Swindon S.296 BR(WR) E10k Freewired 03 March 1968[1] Extant
Wootton Bassett East S.306 BR(WR) E10k Freewired 23 March 1968[1] Extant
Chippenham S.318 BR(WR) E10k Freewired 23 March 1968[1] Extant
Thingley Jcn BR(WR) E10k Freewired 23 March 1968[1] 11 February 1975
Thingley S.320 BR(WR) E10k Freewired 11 February 1975[1] Extant
Wootton Bassett West S.308 BR(WR) E10k Freewired ca. early 1980[1] Extant
Hullavington S.313 BR(WR) E10k Freewired 23 March 1968[1] Extant
Kemble S.332 BR(WR) E10k Freewired 27 July 1968[2] 0108 19 August 2014[3]

The Uffington interlocking was commissioned before Swindon Panel came into existence as it was originally controlled by Uffington signal box. It migrated to control by Swindon Panel on 3 March 1968.

The Swindon interlocking is located at the signal box with the panel and is controlled directly. All the other interlockings are sited at their geographical locations, remote from Swindon Panel, and are controlled through remote control systems.

A small interlocking at Minety, controlled from Minety Crossing Box, existed by 27 July 1968 until 09 August 2014 (when the crossing was converted to CCTV).

Related Documents

References

  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 British Power Signalling Register (http://www.bpsr.org.uk)
  2. K2 Week 30 1968
  3. Swindon Panel Occurrence Book

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