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Journey by Journey => Heart of Wessex => Topic started by: LiskeardRich on March 20, 2017, 06:44:27 pm



Title: Freight derailment east Somerset junction 20/3/17
Post by: LiskeardRich on March 20, 2017, 06:44:27 pm
A freight train has derailed at East Somerset junction. 7 wagons reported off the track. No other details as yet,


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bobm on March 20, 2017, 06:54:32 pm
Seven wagons off. Two on their side.

A set of points destroyed and several broken sleepers.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: John R on March 20, 2017, 07:00:23 pm
National Rail reporting disruption until at least 9pm, which sounds a tad optimistic given that description of the damage.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bignosemac on March 20, 2017, 07:14:45 pm
RAIB have tweeted to say they are en route to investigate.

59001, Yeoman Endeavour, was the loco hauling the stone train.

According to internal sources, the location is exactly the same (set of points 943B) as the derailment in 2008 (https://www.gov.uk/raib-reports/derailment-of-two-locomotives-at-east-somerset-junction).

Note: I've provided the web link to the previous RAIB incident report for reference only. No connection between the two incidents, save for location, is implied or intended.



Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: grahame on March 20, 2017, 08:04:10 pm
20:49 Bristol to Weymouth (due 23:13) terminates at Frome at 21:50
Extra train at 22:08 from Castle Cary to Weymouth, due there at 23:13

Impressive for running as much as possible to time, but I suspect a big fail for Bristol to Weymouth passengers!


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: TaplowGreen on March 20, 2017, 08:45:05 pm
.....as if that wasn't enough.......

Cancellations to services between Bristol Parkway and Cheltenham Spa


Due to a person being hit by a train between Bristol Parkway and Cheltenham Spa the line is blocked.
Train services running through these stations will be cancelled or delayed by up to 60 minutes. Disruption is expected until the end of the day.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: PhilWakely on March 20, 2017, 09:18:21 pm
Cancellations to services between Castle Cary and Westbury

Due to a derailed train (7Z15 - 17:05 Merehead to Acton with 7 wagons off and 2 on their side) between Castle Cary and Westbury all lines are blocked.
Train services running through these stations may be cancelled, delayed by up to 60 minutes or diverted. Disruption is expected until 23:59 21/03.

Additional Information
A freight train has derailed on the line between Castle Cary and Frome blocking all lines. Network Rail response staff are on site assessing the situation however Network Rail have confirmed that the line will be closed on the 21st March 2017. Replacement road transport is being organised to serve all stations without a train service for the remainder of today and all day tomorrow. A shuttle train service will operate between Weymouth and Castle Cary on the 21st March 2017. Customers are advised to check train times before travelling.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Jason on March 21, 2017, 08:36:17 am
News and a picture courtesy of Network Rail here http://www.bbc.co.uk/news/uk-england-39334158 (http://www.bbc.co.uk/news/uk-england-39334158)


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bignosemac on March 21, 2017, 09:15:58 am
The loco and first 23 wagons made it over the points in question. Wagons 24-29 derailed. Wagons 30-38 stayed on the rails.

The loco and first 21 wagons have been moved to Westbury yard. 22-38 remain at the incident site. Heavy lifting equipment is en route from Rugby, due to arrive this afternoon - 21st March 2017.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: ChrisB on March 21, 2017, 09:18:44 am
Quote
The freight train was pulling 38 wagons, when seven of them partially derailed


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bradshaw on March 21, 2017, 09:41:45 am
There are four photos on the Network Rail Twitter feed which show the situation


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bignosemac on March 21, 2017, 09:47:20 am
Quote
The freight train was pulling 38 wagons, when seven of them partially derailed

Internal sources suggest six derailed. 24-29.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: TaplowGreen on March 21, 2017, 10:00:18 am
Out of interest (and please forgive my lack of knowledge) how are derailments usually caused? Not asking anyone to speculate on this one, just interested.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: stuving on March 21, 2017, 10:23:14 am
There are four photos on the Network Rail Twitter feed which show the situation

Is it my imagination, or do the front and back of that train disagree about whether they were going via the Branch Loop?


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: LiskeardRich on March 21, 2017, 11:51:41 am
There are four photos on the Network Rail Twitter feed which show the situation

Is it my imagination, or do the front and back of that train disagree about whether they were going via the branch Loop?

From the photos shown it goes look the case, it won't take much to work out how, but the investigation will look at why,


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: SandTEngineer on March 21, 2017, 01:50:34 pm
The technical term for that is 'splitting the points'..... ::) :P


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bignosemac on March 21, 2017, 01:58:02 pm
Out of interest (and please forgive my lack of knowledge) how are derailments usually caused? Not asking anyone to speculate on this one, just interested.

A multitude of possible causes. Track/points/trackbed failure, axle/bogie/wheel failure, driver error, signaller error, hitting obstruction/animals, deliberate/accidental third party act...

Some recent derailments:

https://www.gov.uk/raib-reports/derailment-at-knaresborough (signaller error)
https://www.gov.uk/raib-reports/derailment-near-angerstein-junction (bogie/suspension poor maintenance)
https://www.gov.uk/raib-reports/derailment-at-godmersham-kent (hit cattle)
https://www.gov.uk/raib-reports/derailment-at-washwood-heath-west-junction (combination of track and rolling stock faults)
https://www.gov.uk/raib-reports/derailment-of-an-empty-passenger-train-at-paddington-station (driver error)
https://www.gov.uk/raib-reports/freight-train-derailment-near-gloucester (track fault - cyclic top)
https://www.gov.uk/raib-reports/derailment-of-a-freight-train-at-barrow-upon-soar-leicestershire (trackbed fault - embankment failed)
https://www.gov.uk/raib-reports/derailment-at-bletchley-junction-bletchley (speed)
https://www.gov.uk/raib-reports/accident-at-falls-of-cruachan-argyll (hit obstruction)




Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Gordon the Blue Engine on March 21, 2017, 04:28:27 pm
Splitting the facing points to the Branch Loop may indeed be a possible cause, but I'm not convinced that NR's 4 photos support this assertion any more than, for example, a track or wagon defect.  As BNM says, best to wait ....


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bobm on March 21, 2017, 04:59:19 pm
In the meantime thanks to bignosemac for taking the time to research that list which shows the many factors which have to be discounted before arriving at the correct one.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bradshaw on March 21, 2017, 08:46:19 pm
GWR Journey Check; line not opening until 25th March.

Looking at the photos and track diagram all points traversed seem to be trailing points, not facing, for a train going to Westbury. There is a facing point further up the line out of sight.
The photos show the signal allowing entry to the branch and the ground signal from down main to branch.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: grahame on March 22, 2017, 04:49:11 am
GWR Journey Check; line not opening until 25th March.

... at one minute to midnight, so not really until 26th


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Thatcham Crossing on March 22, 2017, 07:46:07 am
Tickets booked online last night (National Rail) for 2 family members Newbury-Exeter and return on Sat (25th). Down on the 0859 ex-Newbury, back on 1802 ex-Exeter. I didn't know the booking was being done until I found the confirmation print-out.

Will this even run, or be diverted?


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: TaplowGreen on March 22, 2017, 08:43:38 am
Tickets booked online last night (National Rail) for 2 family members Newbury-Exeter and return on Sat (25th). Down on the 0859 ex-Newbury, back on 1802 ex-Exeter. I didn't know the booking was being done until I found the confirmation print-out.

Will this even run, or be diverted?

Worth tweeting GWR help I'd say?


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Tim on March 22, 2017, 09:09:52 am
Splitting the facing points to the Branch Loop may indeed be a possible cause, but I'm not convinced that NR's 4 photos support this assertion any more than, for example, a track or wagon defect.  As BNM says, best to wait ....

and of course AIUI splitting the points is caused by the points moving with a train on them and you can imagine various causes of that including signalling error and mechanical failure.  And then various causes of those causes.

I expect that they will figure it out fairly soon, but as BNM says best to wait.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: stuving on March 22, 2017, 09:28:27 am
Splitting the facing points to the Branch Loop may indeed be a possible cause, but I'm not convinced that NR's 4 photos support this assertion any more than, for example, a track or wagon defect.  As BNM says, best to wait ....

and of course AIUI splitting the points is caused by the points moving with a train on them and you can imagine various causes of that including signalling error and mechanical failure.  And then various causes of those causes.

I expect that they will figure it out fairly soon, but as BNM says best to wait.

Having had a longer look at those pictures, it does look like the front and back of the train were both planning to join the Up Westbury directly (at points 943A). It was the bit in the middle that had other ideas, and tore up the same bit of track that had to be relaid after the last time. But since one of those stone wagons (very good, for breaking up sleepers) is shown derailed both ways there is no obvious explanation.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: ChrisB on March 22, 2017, 11:07:32 am
Tickets booked online last night (National Rail) for 2 family members Newbury-Exeter and return on Sat (25th). Down on the 0859 ex-Newbury, back on 1802 ex-Exeter. I didn't know the booking was being done until I found the confirmation print-out.

National Rail website doesn't book tickets, does it? I thought you got redirected to a TOC site?


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: eightf48544 on March 22, 2017, 12:26:57 pm
Imagine your tickets will be valid via Reading and Bristol. I would start out earlier from Newbury.

If not they ought to be!


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: PhilWakely on March 22, 2017, 01:21:54 pm
Tickets booked online last night (National Rail) for 2 family members Newbury-Exeter and return on Sat (25th). Down on the 0859 ex-Newbury, back on 1802 ex-Exeter. I didn't know the booking was being done until I found the confirmation print-out.

Imagine your tickets will be valid via Reading and Bristol. I would start out earlier from Newbury.

If not they ought to be!

This is what gwr.com (https://www.gwr.com/travel-updates/live-network-updates/pidd-disruption-information) currently says....
Quote
Disruption between Taunton, Westbury and Weymouth

Disruption between Taunton, Westbury and Weymouth

Due to a derailed freight train, services between Taunton and Westbury, and Weymouth and Westbury are being delayed or cancelled, and replacement buses are running on some routes.

Disruption is expected until at least until Saturday 25th March.

Several de-railed wagons are still full of stone and sand, and engineers advise that a great deal of preparatory work has to be carried out prior to them being moved or scrapped on-site.

What is the impact on customers?

No GWR services are currently able to operate between Frome and Castle Cary.

Customers travelling on GWR High Speed services between London/Reading – Pewsey – Westbury – Castle Cary – Taunton – Devon/Cornwall will find that services are diverted away from the direct route via Castle Cary, normally resulting in extended journey times.  Fast services will generally divert via Swindon and Bristol, slower services will generally operate via Pewsey and then divert via Trowbridge and Bristol.  Some services will call additionally at Trowbridge.

Customers travelling on GWR local services between Bristol – Westbury – Frome – Castle Cary – Yeovil – Weymouth will find that Westbound services from the Bristol/Westbury direction will generally terminate at Frome. Customers at Frome for stations to Weymouth are to travel to Castle Cary by coach.

Customers travelling on local trains beyond Castle Cary will be able to use a special GWR shuttle train service operating between Castle Cary and Weymouth.

Customers at Westbury please travel via Bath and Bristol Temple Meads for Devon/Cornwall AND stations to London.

Customers at Castle Cary are to travel to Taunton by coach for Devon/Cornwall and Westbury by coach for onward train services to stations to London – please note that this is a much longer journey time.

If you are delayed or decide not to travel you may be entitled to some money back.

Please - Check your journey before travelling.

What are the changes to GWR Ticket Restrictions?

Customers due to travel on GWR services affected by this service disruption will be allowed greater ticket restriction flexibility for travel until the line is opened again.
- Customers holding Advance tickets may travel on any GWR departure on the date on the ticket to make their intended journey
- Customer holding Super Off-Peak or Off-Peak tickets may travel on any affected GWR departure, within the date validity of their ticket, to make their intended journey.

So, at a guess your tickets will be valid on any train, but probably not via Reading - but always best to check beforehand.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Timmer on March 22, 2017, 02:19:12 pm
Some great pics of the recovery operation taking place are being posted on the Network Rail Greater Western Twitter Feed:
https://twitter.com/networkrailwest


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Thatcham Crossing on March 22, 2017, 02:20:06 pm
Thanks all for the info and suggestions....

Quote
slower services will generally operate via Pewsey and then divert via Trowbridge and Bristol.  Some services will call additionally at Trowbridge.

I think the service my family members will be using (I'm not travelling myself) will fall into the above category, based on today's evidence of a Paddington-Exeter semi-fast that did operate down the B&H to Pewsey and then via Trowbridge etc.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: signalandtelegraph on March 22, 2017, 09:22:39 pm
Some great pics of the recovery operation taking place are being posted on the Network Rail Greater Western Twitter Feed:
https://twitter.com/networkrailwest

Its a shame the captions for the cranes are wrong.  The one they claim to be theirs is actually Balfour Beattie's Kirow, and the one they claim is the Kirow is actually their own breakdown crane.   ::)


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: chrisr_75 on March 23, 2017, 12:06:53 am
Some great pics of the recovery operation taking place are being posted on the Network Rail Greater Western Twitter Feed:
https://twitter.com/networkrailwest

Interesting, thanks. Quite a mess it's made!

And there was me thinking all of the rail cranes had disappeared decades ago!


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Thatcham Crossing on March 23, 2017, 08:22:40 pm
We contacted GWR this evening (via FB messenger) and got a response within 10 mins. Apparently plan now is that line will re-open 10pm Friday :-)


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: TaplowGreen on March 23, 2017, 09:44:14 pm
We contacted GWR this evening (via FB messenger) and got a response within 10 mins. Apparently plan now is that line will re-open 10pm Friday :-)

I hope you're right but according to the latest update on the website;

Train services running through these stations may be cancelled, delayed by up to 60 minutes or diverted. Disruption is expected until 23:59 25/03.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Adelante_CCT on March 23, 2017, 09:59:04 pm
Network Rails twitter account also states 10pm Friday.

https://twitter.com/networkrailwest
Quote
Work continues to remove the derailed freight wagons in Somerset.  We plan to re-open the line from 22:00 Friday.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: TaplowGreen on March 24, 2017, 09:08:40 am
Network Rails twitter account also states 10pm Friday.

https://twitter.com/networkrailwest
Quote
Work continues to remove the derailed freight wagons in Somerset.  We plan to re-open the line from 22:00 Friday.

Yes they & GWR seem to be (almost) consistent now!

Due to a derailed train between Castle Cary and Westbury all lines are blocked.
Train services running through these stations may be cancelled, delayed by up to 60 minutes or diverted. Disruption is expected until the end of the day.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: bradshaw on March 24, 2017, 06:44:00 pm
Looking at the latest NR twitter feed (#SomersetDerail); has the up Westbury been plain lined temporarily to get the line open tonight?


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: TaplowGreen on March 24, 2017, 08:49:02 pm
.....looks like it's been put back until tomorrow?

A freight train has derailed on the line between Castle Cary and Frome blocking all lines. Network Rail response staff are on site rectifying the situation however Network Rail have confirmed that the line will not be open until the 25th March 2017 at the earliest.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: grahame on March 25, 2017, 07:23:58 am
Now open, trains running at reduces speeds though, delays up to 10 minutes.

Quote
Customer Advice
Arrangements previously made with South West Trains to convey passengers have now been withdrawn.
Arrangements previously made with Cross Country to convey passengers have now been withdrawn.
Arrangements previously made with First Bus route 10: Weymouth (King's Statue) - Upwey (Broadwey Methodist Church) - Dorchester West (Brewery Square), First Bus route 2: Weymouth (King's Statue) - Upwey (Broadwey Methodist Church), First Bus route 57: Yeovil Pen Mill (Station Approach) - Sherborne, Stagecoach bus route 49: Swindon (Bus Station) - Trowbridge (Town Bridge) and the buses of Somerset route 54: Taunton (Bus Station) - Yeovil (Bus Station) to convey passengers have now been withdrawn.

What a shame ... why can't we have a public transport system that routinely allows travel by any reasonable route?


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: TaplowGreen on March 25, 2017, 08:10:22 am
Now open, trains running at reduces speeds though, delays up to 10 minutes.

Quote
Customer Advice
Arrangements previously made with South West Trains to convey passengers have now been withdrawn.
Arrangements previously made with Cross Country to convey passengers have now been withdrawn.
Arrangements previously made with First Bus route 10: Weymouth (King's Statue) - Upwey (Broadwey Methodist Church) - Dorchester West (Brewery Square), First Bus route 2: Weymouth (King's Statue) - Upwey (Broadwey Methodist Church), First Bus route 57: Yeovil Pen Mill (Station Approach) - Sherborne, Stagecoach bus route 49: Swindon (Bus Station) - Trowbridge (Town Bridge) and the buses of Somerset route 54: Taunton (Bus Station) - Yeovil (Bus Station) to convey passengers have now been withdrawn.

What a shame ... why can't we have a public transport system that routinely allows travel by any reasonable route?

I'll say it before the usual suspect does..........."Ooooooooos gonna pay for it?"  ;)


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: LiskeardRich on March 25, 2017, 08:19:16 am
Now open, trains running at reduces speeds though, delays up to 10 minutes.

Quote
Customer Advice
Arrangements previously made with South West Trains to convey passengers have now been withdrawn.
Arrangements previously made with Cross Country to convey passengers have now been withdrawn.
Arrangements previously made with First Bus route 10: Weymouth (King's Statue) - Upwey (Broadwey Methodist Church) - Dorchester West (Brewery Square), First Bus route 2: Weymouth (King's Statue) - Upwey (Broadwey Methodist Church), First Bus route 57: Yeovil Pen Mill (Station Approach) - Sherborne, Stagecoach bus route 49: Swindon (Bus Station) - Trowbridge (Town Bridge) and the buses of Somerset route 54: Taunton (Bus Station) - Yeovil (Bus Station) to convey passengers have now been withdrawn.

What a shame ... why can't we have a public transport system that routinely allows travel by any reasonable route?

I'll say it before the usual suspect does..........."Ooooooooos gonna pay for it?"  ;)

If it was all publicly run it would all be in the same pot. I'll run for cover now!


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: didcotdean on March 25, 2017, 09:13:12 am
>If it was all publicly run it would all be in the same pot. I'll run for cover now!

In Ireland the lack of co-operation if not outright hostility between IE, Bus Éireann and Dublin Bus is legendary and they are all publicly owned.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: grahame on March 25, 2017, 09:14:13 am
What a shame ... why can't we have a public transport system that routinely allows travel by any reasonable route?

I'll say it before the usual suspect does..........."Ooooooooos gonna pay for it?"  ;)

If it was all publicly run it would all be in the same pot. I'll run for cover now!

Needs modelling - but I would suggest that the net income across the board wouldn't be significantly down.  Indeed on of the barriers to people using public transport is the fare complexity and fear of having the wrong ticket or a high fare when better is available.   Tuesday afternoon I was at the ACoRP / DfT seminar in Lincoln and our table did a very interesting exercise for which we chose the fare system and the need to sort out problems for our "exercise".  Although the meeting was "off patch", it was very much GWR territory experts, most with far longer rail industry experience than me, in our group.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: LiskeardRich on March 25, 2017, 10:18:23 am
Through bus tickets are available for certain destinations, and interusable bus/train Rover tickets so there must be some form of revenue allocation in place. The bus companies won't be conveying for nothing.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: eightf48544 on March 26, 2017, 11:19:11 am
IC and IR common fare basis.

Local Train trams bus ferries etc. Tariff Unions with interoperable zonal fares as per London. TFL type organisations  to let  and specify and let all public transport as a concession  for all major cities and towns.

Trouble is it's a ghastly European socialist idea doesn't fit in with Laissez Faire and free markets!


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: grahame on April 03, 2017, 10:20:51 am
From RAIB at https://www.gov.uk/government/news/freight-train-derailment-east-somerset-junction

Quote
At around 17:50 hrs on Monday 20 March, six loaded wagons of an eastbound freight train became derailed as the train passed over East Somerset Junction, between Castle Cary and Frome, while travelling at about 20 mph (32 km/h). The train, the 17:05 hrs service from Merehead to Acton yard, was joining the up Westbury line from the Merehead single branch line.

There were no injuries. The accident resulted in substantial damage to the railway infrastructure; around 100 metres of track including two sets of switches and crossings were destroyed. Train services between London Paddington and the West Country were diverted via Swindon while the wagons were recovered and track repairs took place over the following four days.

The freight train consisted of a class 59 diesel-electric locomotive hauling 38 loaded wagons of types JNA, JHA, HOA and IIA. It was carrying stone from the Merehead quarries for use in the construction industry. The wagons that derailed were the 24th to 29th from the front of the train. The train split between the 21st and 22nd wagons when the derailment occurred, and the train was stopped by the automatic application of the brakes.

The leading wagon which derailed was of the HOA type. The derailment occurred close to where a set of trailing points had been removed and replaced by plain line in 2012.

Our investigation will identify the sequence of events that led to the accident, and how the wagons derailed. It will also include consideration of:
* the condition of the track, its geometry and how it was maintained
* how the wagons were loaded
* the condition of the wagons
* any relevant underlying management factors
Our investigation is independent of any investigation by the railway industry, the British Transport Police or by the industry’s regulator, the Office of Rail and Road.

We will publish our findings, including any recommendations to improve safety, at the conclusion of our investigation. This report will be available on our website.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Chris from Nailsea on December 13, 2017, 11:49:34 am
The Rail Accident Investigation Branch (RAIB) has now published its report (https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/666685/R192017_171213_East_Somerset_Junction.pdf).

Quote
(https://assets.publishing.service.gov.uk/government/uploads/system/uploads/image_data/file/70045/s300_East_Somerset_Junction.jpg)

Summary

At about 17:49 hrs on Monday 20 March 2017, six wagons of a freight train carrying aggregates from Merehead Quarry to Acton Yard derailed at East Somerset Junction, between Westbury and Castle Cary. The accident blocked the Up Westbury line, and the train stopped when the brakes applied automatically following the parting of a coupling. There were no injuries.

The derailment occurred due to a loss of track integrity: the fixity of the right-hand rail was lost due to progressive failure of the chairscrews under the loads from freight trains traversing the curve, leading to gauge spread. The investigation identified that the design of the track was sub-optimal, following replacement of a set of points with plain line in 2010. The signs of gauge spread were not identified during inspections of the track by staff from Westbury track maintenance depot, and the section of line where the derailment occurred had not been subject to mandatory geometry measurements.

Recommendations

The RAIB has made four recommendations addressed to Network Rail. These cover enhancements to the company’s procedures for plain-lining of points, mitigation of risk at locations where points have previously been plain-lined, improvements to planning the operation of track measurement trains and evaluating the delivery of key track maintenance activities in the Westbury area.

The RAIB has also made a learning point, reinforcing the importance of identifying gauge spread on sections of curved track which may be subject to high lateral loads.



Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: SandTEngineer on December 13, 2017, 04:34:39 pm
I think the report is quite damming of the NR infrastructure maintenance (or non-maintenance) in the Westbury area.  Explains a lot why the main line is in such a state between Witham and Southcote Junction (one of the worst areas for ride I have ever encountered in my 50 years of train travel).  The number of significant track twists and dips beggars belief that there have never been further derailments (and I do hope that something is done before such an event).  I say that as a passenger in a fairly comfortable MK3 coach, so I would hate to think what its like for drivers at the front end :(


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: rower40 on December 14, 2017, 04:59:56 pm
I unknowed that fixity was a word.


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: stuving on December 14, 2017, 07:49:49 pm
I unknowed that fixity was a word.

It's a standard railway term, but does occur elsewhere. Would you prefer fixion?


Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: Chris from Nailsea on December 15, 2017, 12:56:17 am
If it's alright with the Oxford Dictionary (https://en.oxforddictionaries.com/definition/fixity), it's alright with me.  ;)



Title: Re: Freight derailment east Somerset junction 20/3/17
Post by: rower40 on December 15, 2017, 01:43:05 pm
Fair do's.  It's clearly the best word for the situation.  I'd considered "security", "stability", "rigidity", and "fixedness", but none of them are ideal.
It is now in my vocabulary!  Sorry to derail (ho ho) the thread.