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Signalling problems Havant and Guildford 24th/25th May

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Signalling problems Havant and Guildford 24th/25th May

Unread postby John Webb » Thu May 25, 2017 8:45 am

From https://www.journeycheck.southwesttrains.co.uk/southwesttrains/
Due to a problem with the track safety system which stops two trains being in the same section of track at the same time between Havant and Guildford trains have to run at reduced speed on all lines.
What's Going On:
Train services running through these stations may be delayed by up to 30 minutes or revised. Disruption is expected until the end of the day.
What We're Doing About It:
At 10:37 on Wednesday 24 May, the track safety system between Witley and Haslemere stations showed incorrectly that there was a train occupying a section of track. This meant that the signalling system would not allow a second train to occupy the same section. To allow trains to proceed safely into the affected area the signal operator manually checked that the track was clear and verbally advise each train. This meant that trains were delayed whilst this process took place.
At 10:45 a similar issue occurred on the Waterloo-bound line at Liss station which required the signaller to manually check the track was clear and verbally give permission to each train to proceed. This created delays on the services towards Guildford.
Our engineers were unable to investigate the problems during the day yesterday without completely blocking the line in both directions. Our control room made the decision to continue running services as delayed and to complete the works overnight therefore still providing a train service between London and Portsmouth.
Investigation works occurred overnight and our team were not able to identify the root cause of the faults. As such the process of manually checking each section of track will continue into today, this will result in delays and alterations. Engineers have remained on site today and are continuing to work hard to rectify the problem.
Our control centre are currently developing a plan to enable further works to be undertaken to the signalling system. This will likely start at around 10:30am and involve replacing services towards Havant with road transport for a part of the journey. We will update this message with more details as soon as they are known.......

Is this area covered by traditional TCs or axle counters?
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Re: Signalling problems Havant and Guildford 24th/25th May

Unread postby Stuart Johnson » Thu May 25, 2017 11:57 am

This is a track circuit problem.
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Re: Signalling problems Havant and Guildford 24th/25th May

Unread postby John Webb » Thu May 25, 2017 3:25 pm

Thanks!
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Re: Signalling problems Havant and Guildford 24th/25th May

Unread postby scarpa » Fri May 26, 2017 7:19 am

The reasons why its taking much longer may be due to several items .A partial short requires meticulous searching even with detection instrument, ballast covering the sleepers must be cleared, the track circuit may be up to a mile in length ,In rare situations there may be two different faults unrelated.Safety of staff must be taken into account. Most times faults are found quickly and rectified by experienced and dedicated teams. The delay time soon builds up to rail traffic due to stopping at protecting signals receiving instructions from the signalman and then proceeding at a reduced speed through the affected area .
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