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October 12, 2008, 06:22:07 AM *
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First Great Western Coffee Shop > Journey by Journey > London to Didcot and Oxford > SPAD at Didcot North Junction
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Author Topic: SPAD at Didcot North Junction  (Read 1150 times)
eightf48544
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« on: March 24, 2008, 11:16:52 AM »
Does anyone know anything about a recent  SPAD at Didcot North Junction?

It was allegedly less than 20 seconds away from a collision.
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chris from nailsea
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« Reply #1 on: March 24, 2008, 11:58:39 AM »
Is this it, by any chance?

See http://www.raib.gov.uk/publications/current_investigations_register/070822_didcot.cfm
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devon_metro
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« Reply #2 on: March 24, 2008, 02:39:42 PM »
Quote from: eightf48544 on March 24, 2008, 11:16:52 AM
Does anyone know anything about a recent  SPAD at Didcot North Junction?

It was allegedly less than 20 seconds away from a collision.

Quite a worrying story whereby an HST spadded off the avoider and if the turbo hadn't accelerated away from the junction having seem the approaching HST, things might have turned out differently!
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eightf48544
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« Reply #3 on: March 26, 2008, 10:14:28 AM »
Thanks Chris that's the one.

Agree with devon metro it's worrying.

Hadn't realised it was such a long time ago, I only heard about it last week.

The RAIB sems a long time producing their report. Hopefully it will shed some light on why despite the TWPS apparently working on the HST it didn't stop more quickly after passing the signal.

Does anyone know if the Didcot avoiding line has ATP as well or is that just fitted to the mainlines to Swindon?
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devon_metro
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« Reply #4 on: March 26, 2008, 05:43:38 PM »
It has ARS although all signalling systems were working properly, the HST was simply going to fast (bearing in mind ATP does not work once leaving the mainline)
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Jim
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« Reply #5 on: March 26, 2008, 06:21:39 PM »
Quote from: devon_metro on March 26, 2008, 05:43:38 PM
It has ARS although all signalling systems were working properly, the HST was simply going to fast (bearing in mind ATP does not work once leaving the mainline)

ATP don't work over 70MPH either IIRC.
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Jim Smiley
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devon_metro
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« Reply #6 on: March 26, 2008, 07:19:01 PM »
ATP works 100% of the time between Bristol Temple Meads/Parkway and London Paddington  Wink
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smokey
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« Reply #7 on: March 26, 2008, 07:34:26 PM »
Quote from: Jim on March 26, 2008, 06:21:39 PM
Quote from: devon_metro on March 26, 2008, 05:43:38 PM
It has ARS although all signalling systems were working properly, the HST was simply going to fast (bearing in mind ATP does not work once leaving the mainline)

ATP don't work over 70MPH either IIRC.

ATP is an advanced system that is fool proof.
IIRC it's TPWS that can't be relied on above 70MPH for all incidents.
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Jim
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« Reply #8 on: March 26, 2008, 07:49:28 PM »
Quote from: smokey on March 26, 2008, 07:34:26 PM
Quote from: Jim on March 26, 2008, 06:21:39 PM
Quote from: devon_metro on March 26, 2008, 05:43:38 PM
It has ARS although all signalling systems were working properly, the HST was simply going to fast (bearing in mind ATP does not work once leaving the mainline)

ATP don't work over 70MPH either IIRC.

ATP is an advanced system that is fool proof.
IIRC it's TPWS that can't be relied on above 70MPH for all incidents.


Ah bugger it is.
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Jim Smiley
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swlines
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« Reply #9 on: March 29, 2008, 11:44:24 PM »
Hence why there is TPWS+ which works up to 100mph, and now TPWS- which works under 20mph  Huh
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