South Marston - Revision history

Danny: WON 2007-01 added

2014-08-24T19:17:40Z

WON 2007-01 added

← Older revision		Revision as of 19:17, 24 August 2014
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	South Marston is a junction connection to 'Swindon Distribution Centre' (South Marston Euroterminal) between [[Highworth]] and [[Bourton]].		South Marston is a junction connection to 'Swindon Distribution Centre' (South Marston Euroterminal) between [[Highworth]] and [[Bourton]].

	==Commissioning==		==First Commissioning Plan==

	It was planned to be commissioned on 7 and 14 February 2000, as described in [[GWS.15]], but, due to 'construction difficulties' the work did not take place then.		It was planned to be commissioned on 7 and 14 February 2000, as described in [[GWS.15]], but, due to 'construction difficulties' the work did not take place then.
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	[[File:WON-2000-01.png \| border]]		[[File:WON-2000-01.png \| border]]

			==Second Commissioning Plan==

	A second plan to commission the junction was planned for February 2002. As part of this 2002 scheme the points were brought into use.		A second plan to commission the junction was planned for February 2002. As part of this 2002 scheme the points were brought into use.
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	[[File:WON-2002-04.png \| border]]		[[File:WON-2002-04.png \| border]]

			==Third Commissioning==

			Anecdotal evidence from signallers at the time confirm that the connections ''were'' officially in use (even if not used) by at least 2004.

			==Fourth Commissioning==

			At some point, after very little use, the South Marston connections were taken out of use again (or maybe fell out of use?), until it was, once again, brought into use, by a WON notice. All the details of which accord with the 2002 commissioning.

			[[File:WON-2007-01.png \| border]]

			Anecdotal evidence from signallers at the time suggest that the change of status would more accurately be described as 'bringing into ''regular'' use', and that it was never officially out of use after 2004.

	==Panel Alterations==		==Panel Alterations==
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	This layout was found to be unsatisfactory and the Challow-Bourton tiles were subsequently moved back down in line with the rest of the panel, although slightly further left than they had previously been (onto the end of the new South Marston tiles). With the layout being condensed where Uffington Loops used to take up space (removed in the early 1990s), everything just about fitted in.		This layout was found to be unsatisfactory and the Challow-Bourton tiles were subsequently moved back down in line with the rest of the panel, although slightly further left than they had previously been (onto the end of the new South Marston tiles). With the layout being condensed where Uffington Loops used to take up space (removed in the early 1990s), everything just about fitted in.



	==Interlocking==		==Interlocking==

Danny: Story of moving Dominos added

2014-08-24T18:15:26Z

Story of moving Dominos added

← Older revision		Revision as of 18:15, 24 August 2014
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	[[File:South_Marston_panel.jpg\|thumb\|~~500px~~\|right\|South Marston on Swindon Panel]]		[[File:South_Marston_panel.jpg\|thumb\|450px\|right\|South Marston on Swindon Panel]]

	==Overview==		==Overview==
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	[[File:WON-2000-03.png \| border]]		[[File:WON-2000-03.png \| border]]

			[[File:Pre-South_Marston_panel.jpg\|thumb\|450px\|right\|The Panel before the South Marston addition. [Chris Bellett]]]
	As the point fittings '''had''' been installed (but not commissioned) in the 2000 work, controlled signals were needed to protect them. So [[UM.75]] had been converted to controlled signal [[SN.81]] and [[DM.73]] had been converted to a controlled signal temporarily numbered [[SN.998]], advertised by WON entry, shortly after the aborted 2000 work.		As the point fittings '''had''' been installed (but not commissioned) in the 2000 work, controlled signals were needed to protect them. So [[UM.75]] had been converted to controlled signal [[SN.81]] and [[DM.73]] had been converted to a controlled signal temporarily numbered [[SN.998]], advertised by WON entry, shortly after the aborted 2000 work.

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	[[File:WON-2002-04.png \| border]]		[[File:WON-2002-04.png \| border]]

			==Panel Alterations==

			The panel was originally laid out without the South Marston infrastructure, and while altering individual tiles on an Integra panel is (relatively) easy, inserting extra length in the panel is not so easy.

			Initially, all the Dominos between the Challow end of the panel and Bourton were moved up several spaces, so as to run along the second and third horizontal line of tiles in the panel. That then allowed the new South Marston layout Dominos to be added to the remaining 'end' of the Highworth part of the panel. This layout left a huge amount of blank space in the bottom left side of the panel.

			This layout was found to be unsatisfactory and the Challow-Bourton tiles were subsequently moved back down in line with the rest of the panel, although slightly further left than they had previously been (onto the end of the new South Marston tiles). With the layout being condensed where Uffington Loops used to take up space (removed in the early 1990s), everything just about fitted in.

	==Interlocking==		==Interlocking==

Danny: Formatting

2014-08-24T17:23:30Z

Formatting

← Older revision		Revision as of 17:23, 24 August 2014
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	[[File:South_Marston_panel.jpg\|thumb\|~~300px~~\|right\|South Marston on Swindon Panel]]		[[File:South_Marston_panel.jpg\|thumb\|500px\|right\|South Marston on Swindon Panel]]

	==Overview==		==Overview==
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	The first suggestion of there being an interlocking at South Marston was in the WON entry above when [[UM.75]] and [[DM.73]] were converted to [[SN.81]] and [[SN.998]] respectively.		The first suggestion of there being an interlocking at South Marston was in the WON entry above when [[UM.75]] and [[DM.73]] were converted to [[SN.81]] and [[SN.998]] respectively.

	[[File:South_Marston_interlocking_switches.jpg\|thumb\|300px\|~~right~~\|South Marston on Swindon Panel]]		[[File:South_Marston_interlocking_switches.jpg\|thumb\|300px\|left\|South Marston on Swindon Panel]]

	Being a later addition than the other interlocking, a different format of controls was provided for the signalman, including separate alarms for earth faults and the intruder alarm on the relay room.		Being a later addition than the other interlocking, a different format of controls was provided for the signalman, including separate alarms for earth faults and the intruder alarm on the relay room.

Danny: Simultaneous approach switch added

2014-08-24T17:22:46Z

Simultaneous approach switch added

← Older revision		Revision as of 17:22, 24 August 2014
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			[[File:South_Marston_panel.jpg\|thumb\|300px\|right\|South Marston on Swindon Panel]]

	==Overview==		==Overview==

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	The first suggestion of there being an interlocking at South Marston was in the WON entry above when [[UM.75]] and [[DM.73]] were converted to [[SN.81]] and [[SN.998]] respectively.		The first suggestion of there being an interlocking at South Marston was in the WON entry above when [[UM.75]] and [[DM.73]] were converted to [[SN.81]] and [[SN.998]] respectively.

			[[File:South_Marston_interlocking_switches.jpg\|thumb\|300px\|right\|South Marston on Swindon Panel]]

	Being a later addition than the other interlocking, a different format of controls was provided for the signalman, including separate alarms for earth faults and the intruder alarm on the relay room.		Being a later addition than the other interlocking, a different format of controls was provided for the signalman, including separate alarms for earth faults and the intruder alarm on the relay room.
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	Points: [[311]], [[312 South Marston\|312]].		Points: [[311]], [[312 South Marston\|312]].

			[[File:South_Marston_simultaneous_approach.jpg\|thumb\|300px\|right\|Permit Simultaneous Approach to [[SN.81]] and [[SN.604]].]]

			As South Marston only has a facing crossover, there is a risk that a signalman could inadvertently route a train on the Up Main towards South Marston and a down train down the Up Main towards South Marston at the same time. Unless the down train is destined for the Euroterminal, this would mean the two trains arrived at South Marston and neither would have anywhere to go. Perfectly safe but hugely operationally inconvenient.

			However, it would also not be desirable to remove this functionality, otherwise it would not be available during a failure of, say, [[311]] points when a train ''does'' require to access the Euroterminal.

			To maintain the flexibility but control the risk, an 'are you sure' switch was provided in Swindon Panel which had to be operated to allow the opposing routes to clear.

	==Usage==		==Usage==

	The Euroterminal has not seen anywhere near the volume of rail traffic originally envisaged, there has never been any regular traffic and there can be many months or years between trains using the connection.		The Euroterminal has not seen anywhere near the volume of rail traffic originally envisaged, there has never been any regular traffic and there can be many months or years between trains using the connection.

Danny: Detail added

2014-08-24T17:08:57Z

Detail added

@@ Line 1: / Line 1: @@
 ==Overview==
-South Marston is a junction connection to 'Swindon Distribution Centre' (South Marston Euroterminal).
+South Marston is a junction connection to 'Swindon Distribution Centre' (South Marston Euroterminal) between [[Highworth]] and [[Bourton]].
 It was planned to be commissioned on 7 and 14 February 2000, as described in [[GWS.15]], but, due to 'construction difficulties' the work did not take place then.
@@ Line 10: / Line 12: @@
 [[File:WON-2000-01.png | border]]
 A second plan to commission the junction was planned for February 2002. As part of this 2002 scheme the points were brought into use.
@@ Line 30: / Line 30: @@
 [[File:WON-2002-04.png | border]]

Danny at 16:46, 24 August 2014

2014-08-24T16:46:51Z

← Older revision		Revision as of 16:46, 24 August 2014
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	The new layout was planned to be brought into use on 11 and 18 January 2002.		The new layout was planned to be brought into use on 11 and 18 January 2002.

	[[File:WON-2002-02.png \| border]]		[[File:WON-2002-06.png \| border]]

	and		and

Danny: Craeted

2014-08-24T15:42:32Z

Craeted

← Older revision		Revision as of 15:42, 24 August 2014
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	~~The first reference~~ to South Marston ~~relates~~ to the ~~commissioning of~~ [[SN.81]] ~~at 0645 on Sunday 11 June~~ 2000.		==Overview==

			South Marston is a junction connection to 'Swindon Distribution Centre' (South Marston Euroterminal).

			It was planned to be commissioned on 7 and 14 February 2000, as described in [[GWS.15]], but, due to 'construction difficulties' the work did not take place then.

			[[File:WON-2000-03.png \| border]]

			As the point fittings '''had''' been installed (but not commissioned) in the 2000 work, controlled signals were needed to protect them. So [[UM.75]] had been converted to controlled signal [[SN.81]] and [[DM.73]] had been converted to a controlled signal temporarily numbered [[SN.998]], advertised by WON entry, shortly after the aborted 2000 work.

	[[File:WON-2000-01.png \| border]]		[[File:WON-2000-01.png \| border]]

	~~----~~		This is the first suggestion of there being an interlocking at South Marston.

	~~The ATP loop for [[SN.81]]~~ was ~~published as disconnected~~ for ~~two weeks from 04~~.~~50 on Monday 14 January~~ 2002~~. (A ironic entry considering how many ATP loops~~ were ~~out of~~ use ~~for months or years!)~~		A second plan to commission the junction was planned for February 2002. As part of this 2002 scheme the points were brought into use.

	~~[[File:WON-~~2002~~-01~~.~~png \| border]]~~		The 2002 plan was broadly the same as the 2000 plan (apart from the signals and points described above).

	----		A new signal was programmed for to the Goods Reception Line, [[SN.897]], in rear of (and in addition to) the previously advertised [[SN.899]]. [[SN.897]] is sited at the end of the Goods Reception, by the gates into the Euroterminal. It is back-to-back with a stop board for movements into the terminal. (The stop board is 44 SLUs (310 yards) from [[SN.899]].) The stop board is fitted with a white light operated by the PiC in the terminal that authorises trains to proceed. The line rises towards the Euroterminal on a 1:250 gradient.

	The new layout was planned to be brought into use on 11 and 18 January 2002.		The new layout was planned to be brought into use on 11 and 18 January 2002.

Danny at 12:14, 24 August 2014

2014-08-24T12:14:26Z

← Older revision		Revision as of 12:14, 24 August 2014
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	----		----

	The new layout was brought into use on 11 and 18 January 2002.		The new layout was planned to be brought into use on 11 and 18 January 2002.

	[[File:WON-2002-02.png \| border]]		[[File:WON-2002-02.png \| border]]

Danny: 2002-04 won added

2014-08-24T12:08:07Z

2002-04 won added

← Older revision		Revision as of 12:08, 24 August 2014
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	[[File:WON-2002-03.png \| border]]		[[File:WON-2002-03.png \| border]]

			but wasn't....

			[[File:WON-2002-04.png \| border]]

Danny: Borders added

2014-08-24T12:01:04Z

Borders added

← Older revision		Revision as of 12:01, 24 August 2014
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	The ATP loop for [[SN.81]] was published as disconnected for two weeks from 04.50 on Monday 14 January 2002. (A ironic entry considering how many ATP loops were out of use for months or years!)		The ATP loop for [[SN.81]] was published as disconnected for two weeks from 04.50 on Monday 14 January 2002. (A ironic entry considering how many ATP loops were out of use for months or years!)

	[[File:WON-2002-01.png]]		[[File:WON-2002-01.png \| border]]

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