⚠️VIDEO: A major landslip has damaged our main line, just outside of #Hook, in Hampshire.
📢@SW_Help customers are being advised not to travel tomorrow if their journey is to or from London to the south or west of Basingstoke.
Here's route director Mark on what's happened 👇 /1
This link takes you through to our press release, which has more details.
networkrailmediacentre.co.uk/news/video-maj…
TLDR? We will summarise it in a few Tweets on this thread. /2
A 44m section of 10m-high embankment, built largely of London Clay in the late 1830s, has slid out from underneath the railway, leaving one track in mid-air.
It's also exposed the ends of the sleepers of the track next to it (sleepers are what rails are fixed to) /3
Exposed sleeper ends means there's no lateral stability for the track and it's right on the edge of the backscar (slip site).
That is all bad news as it means we have lost both Westbound lines. /4
This is the location in happier times, photographed by @nrairops a few years ago.
The slip is to the right, halfway up the picture. /5
With no Westbound tracks, we need to work with @SW_Help and our signaller colleagues to create a train plan that will make use of the remaining London-bound lines and the diversionary route via Haslemere as we have done this weekend. /6
@SW_Help That plan is not created yet and therefore we are advising customers not to travel tomorrow (Monday) as we can't advise them on how to complete their journeys.
Once the plan is in place, it will generate a timetable and @SW_Help will share it with you. /7
Network Rail engineers and suppliers are working on designs to fix the slip, and once we have them in place, we will know how long this is likely to take to repair.
It's what engineers call a rotational failure, and it will be a major job to do. /8
To conclude, we are so sorry for this extra disruption, after a weekend of disruption, and we can only apologise and say we will do everything we can to repair the railway and run trains again.
Many thanks. /Ends.

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More from @NetworkRailWssx

Jan 15
UPDATE on #Haslemere broken rail for @SW_Help customers.
We have teams on their way to site to disconnect signalling equipment around this joint and cut the offending section out.
They will then rebuild the joint with fresh rail, reconnect the signalling and reopen the line/1
As it’s an insulated joint, it’s part of the signalling system too, and will require testing before we run trains.
Our train detection equipment in the area uses low electric currents run through the rails, and the insulation keeps the currents apart. /2
For that reason it will take us at least until 1530 today to get the job done and we advise customers travelling between London Waterloo and Portsmouth/ Weymouth (and reverse) to avoid travelling if they can.
Please follow @SW_Help for ticket and travel information. /3
Read 4 tweets
Jan 15
⚠️🛤️ We’re really sorry to say a routine track inspection has found a broken rail at #Haslemere (pictured) on our diversionary route for @SW_Help passengers heading to Portsmouth, Southampton and Weymouth (the main line is blocked by engineering work around Hook). /1
We are unable to run trains over the crack in the picture as its location means it could cause a derailment if the rail was to come apart under a train.
For that reason, Portsmouth and Weymouth services can’t run to London until we can fix the problem. /2
We’re planning our response now and once we’ve got a plan and resource in place, we can give an accurate timescale for when we can get the line open again.
The crack sits in an insulated rail joint, which means we can’t just clamp the rail and run trains slowly /3
Read 5 tweets
Aug 30, 2022
An Emergency Speed Restriction is in place between #Tisbury and #Gillingham on the West of England line.

Later this week, @SW_Help will announce a temporary, revised timetable for services between #Salisbury, #Yeovil Junction and #Exeter St Davids.

Here's what's happening 🧵 Image
The very hot and dry conditions of recent weeks has dried out the clay soil beneath the embankments between Tisbury and Gillingham 🌡️

When clay dries out, it shrinks. This is causing track defects, which means we cannot run trains at full speed 🚆
You can see in this photo that the level of the track has been disturbed because of the earth moving 🛤️

Vegetation by the line is also sucking up the remaining moisture in the embankment and causing more earth movements 🌳

It's a problem known as Soil Moisture Deficit. Image
Read 8 tweets
Jul 11, 2022
⚠️🚦 We'd like to say how sorry we are for the continued disruption to @SW_Help customers between Yeovil Junction/Crewkerne and Exeter due to a signalling problem which means we've been unable to signal trains in a 35-mile section of railway.
networkrail.co.uk/running-the-ra…
The railway is divided into sections where only 1 train can be. The system knows if a train's there thanks to two forms of tech, track circuits and axle counters. Axle counters spot changes in magnetic fields when a train wheel passes by to literally count the wheels on a train.
Despite lots of testing on the axle counter system since it failed on Sunday morning, including replacing multiple components and calling in experts from the manufacturers, we've been unable to find the cause of the fault. So we need to reset the system which can take a few hours
Read 9 tweets
Jul 11, 2022
⚠️🚦 We're really sorry for the ongoing disruption to @SW_Help customers between Yeovil Junction/Crewkerne and Exeter, which has been ongoing since Sunday. We've lost part of our signalling system in the section in the picture and it means we can't run trains through the area. /1
@SW_Help Our signallers can see where trains are using technology called "axle counters" which are usually very reliable. They literally count the axles of trains passing each signal and make sure each train is complete and the track is clear by comparing the numbers. /2
Yesterday we lost control of multiple counters, which showed as "red" when there were no trains in the area. This is a fail-safe situation to keep trains and customers safe, but it does mean huge disruption as signals are also held at red. /3
Read 8 tweets
Jun 11, 2021
We're so sorry for the disruption @SW_Help customers are enduring today from @LondonWaterloo . We've got a technical update for you, but first here's our regional director, John Halsall, with a message for passengers: 👇 /1
@SW_Help @LondonWaterloo On the ground, we've narrowed the failure to what we think is a damaged stretch of cable in the Surbiton area - two cables actually - carrying two separate data links. /2
It's in a part of the railway that's difficult to access, so our plan is to roll out 500m of new cable, and bypass the damaged section. Our teams have been on site all day and continue to work hard to get things running again. /3
Read 5 tweets

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