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:

{| class="wikitable"
! Interlocking !! Site Code!! Type !! Commissioned !! De-commissioned
|-
| [[Uffington]] || S.277 || BR(WR) E10k Freewired || 30 May 1965<ref name="BPSR">British Power Signalling Register (http://www.bpsr.org.uk)</ref> || Extant ||
|-
| [[Bourton]] || S.280 || BR(WR) E10k Freewired || 01 October 1977<ref name="BPSR" /> || Extant ||
|-
| [[South Marston]] || S.282 || BR(WR) E10k Freewired || 11 June 2000<ref name="BPSR" /> || Extant ||
|-
| [[Highworth]] || S.283 || BR(WR) E10k Freewired || 03 March 1968<ref name="BPSR" /> || Extant ||
|-
| Swindon || S.296 || BR(WR) E10k Freewired || 03 March 1968<ref name="BPSR" /> || Extant ||
|-
| [[Wootton Bassett]] East || S.306 || BR(WR) E10k Freewired || 23 March 1968<ref name="BPSR" /> || Extant ||
|-
| [[Chippenham]] || S.318 || BR(WR) E10k Freewired || 23 March 1968<ref name="BPSR" /> || Extant ||
|-
| [[Thingley]] Jcn || || BR(WR) E10k Freewired || 23 March 1968<ref name="BPSR" /> || 11 February 1975 ||
|-
| [[Thingley]] || S.320 || BR(WR) E10k Freewired || 11 February 1975<ref name="BPSR" /> || Extant ||
|-
| [[Wootton Bassett]] West || S.308 || BR(WR) E10k Freewired || ca. early 1980<ref name="BPSR" /> || Extant ||
|-
| [[Hullavington]] || S.313 || BR(WR) E10k Freewired || 23 March 1968<ref name="BPSR" /> || Extant ||
|-
| [[Kemble]] || S.332 || BR(WR) E10k Freewired || 27 July 1968<ref name="BPSR" /> || Extant ||
|-
|}

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 located at their geographical locations, remote from Swindon Panel, and are controlled through remote control systems.

==References==
<references />

Researchers compiling pages - please see the [[Research Guidance - Routes]]

Interlockings

2014-07-03T14:11:38Z

Andy Overton: Added in detail about E10k interlocking history and added note regarding Uffington interlocking

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:

{| class="wikitable"
! Interlocking !! Site Code!! Type !! Commissioned !! De-commissioned
|-
| [[Uffington]] || S.277 || 30 May 1965<ref name="BPSR">British Power Signalling Register (http://www.bpsr.org.uk)</ref> || Extant ||
|-
| [[Bourton]] || S.280 || 01 October 1977<ref name="BPSR" /> || Extant ||
|-
| [[South Marston]] || S.282 || 11 June 2000<ref name="BPSR" /> || Extant ||
|-
| [[Highworth]] || S.283 || 03 March 1968<ref name="BPSR" /> || Extant ||
|-
| Swindon || S.296 || 03 March 1968<ref name="BPSR" /> || Extant ||
|-
| [[Wootton Bassett]] East || S.306 || 23 March 1968<ref name="BPSR" /> || Extant ||
|-
| [[Chippenham]] || S.318 || 23 March 1968<ref name="BPSR" /> || Extant ||
|-
| [[Thingley]] Jcn || || 23 March 1968<ref name="BPSR" /> || 11 February 1975 ||
|-
| [[Thingley]] || S.320 || 11 February 1975<ref name="BPSR" /> || Extant ||
|-
| [[Wootton Bassett]] West || S.308 || ca. early 1980<ref name="BPSR" /> || Extant ||
|-
| [[Hullavington]] || S.313 || 23 March 1968<ref name="BPSR" /> || Extant ||
|-
| Purton? || || || ||
|-
| [[Minety]] || S.332 || || Extant ||
|-
| [[Kemble]] || S.332 || 27 July 1968<ref name="BPSR" /> || Extant ||
|-
|}

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.

==References==
<references />

Researchers compiling pages - please see the [[Research Guidance - Routes]]