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Collision and derailment near Salisbury (Fisherton Tunnel) 31/10/21

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Bletchleyite

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It’s certainly technically possible to design signalling such that track circuits must be operated in a logical order, and for signals to be turned to danger if an irregularity is detected.

It doesn't strike me as a hugely difficult IT problem (if built as an added failsafe on top), but the question would be more whether UK track circuit block signalling is built that way or not?
 

Rob_76

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richw

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Can I just say that I think it's sickening that there's some railway/emergency services worker getting their rocks off at sharing images from the scene.
Or evacuated passengers? There’s allegedly a video on tiktok inside a carriage according to a Facebook comment I’ve just scrolled past!
 

Strathclyder

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Let's remember aswell that this forum has been quoted before in the media, with the speculation being took as fact. There's currently 850 guests browsing this thread, and we wouldn't want anything that's conjecture on here to be publicised as fact.
Agreed. Best not to let this thread be a repeat of the Carmont one in this respect.
 

kels430

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Can I just say that I think it's sickening that there's some railway/emergency services worker getting their rocks off at sharing images from the scene.
It could just be a passenger that was on the train, 99% of them will have a camera on their phone.
 

jon0844

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Or evacuated passengers? There’s allegedly an internal video on tiktok according to a Facebook comment I’ve just scrolled past!

There's always going to be something on TikTok! People involved in any incident these days will want to let as many people as they can know, and hope it will go viral. Sad but true.
 

DJames

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Or evacuated passengers? There’s allegedly an internal video on tiktok according to a Facebook comment I’ve just scrolled past!

It appears so, I've seen an image that appears to be from a video of the inside of one of the units, which has a Tik Tok watermark. I won't be sharing it for obvious reasons.
 

bramling

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Can I just say that I think it's sickening that there's some railway/emergency services worker getting their rocks off at sharing images from the scene.

As a point of order, two passenger trains were involved, which by definition would have been carrying passengers. Nowadays pretty much everyone has a camera phone and the ability to share images instantly.
 

Rob_76

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Or evacuated passengers? There’s allegedly an internal video on tiktok according to a Facebook comment I’ve just scrolled past!
It could be I suppose, but that PlaneTrainHub chap on Twitter has said he got them from a railway source.
 

Mike395

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Mod note: Please keep speculation to a minimum here - particularly as this incident is being reported in the mainstream media, we need to ensure speculation posted here isn't picked up and reported as fact. Additionally, this is a fast-moving thread and thus the forum team can't keep on top of all posts in real-time. If you see anything that concerns you, please use the Report functionality.
 

pompeyfan

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I’m confused, I don’t think that train is actually involved in the incident. If it’s the rear cab of the incident train it’s likely to be on the other track surely?
 

londonboi198o5

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I’m confused, I don’t think that train is actually involved in the incident. If it’s the rear cab of the incident train it’s likely to be on the other track surely?
it wouldnt be a rear cab the train is travelling on the left hand rail which is the rails it would be driving on in the direction. Just a thought.
 

Gloster

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Signals should have batteries which would keep them lit if mains power is lost and the signal protecting the junction certainly did in 1980. If there are any problems, then they should go to red. I am not going to speculate further on something that is very odd.
 

VP185

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I guess the guard has switched the hazard lights on the rear of the SWR unit.
 

David Stewart

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Sorry this is speculation but
Thats what I was thinking, the image show in the tunnel makes no sense
Yes I was wondering that. Sorry for the speculation but I was wondering if the diamond crossing is a switched diamond then its possible that the second train was diverted onto the other line.

Moderator note: This is not the case; it is a fixed diamond
 
Last edited by a moderator:

Tomnick

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It doesn't strike me as a hugely difficult IT problem (if built as an added failsafe on top), but the question would be more whether UK track circuit block signalling is built that way or not?
It is possible and newer systems than that at Salisbury (the control system rather than the interlocking as I understand it) detect a track circuit occupying or clearing out of sequence. I don't know whether it puts signals back to danger though.
 

Horizon22

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I've seen one report that all passengers ok on the SWR but unknown on the GWR service, have you heard different? Extremely anxious now as I know a few of the Salisbury and Westbury crews.

Yes it appears to be the worst was a bad cut to the head for a passenger, but treatable at the scene. The GWR driver appeared to be assisting both trains.
 

Energy

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Signals should have batteries which would keep them lit if mains power is lost and the signal protecting the junction certainly did in 1980. If there are any problems, then they should go to red. I am not going to speculate further on something that is very odd.
I'm assuming the driver should treat it as a red if the signal has lost power completely and is not lighting.
 

Ken H

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Signals should have batteries which would keep them lit if mains power is lost and the signal protecting the junction certainly did in 1980. If there are any problems, then they should go to red. I am not going to speculate further on something that is very odd.
do they have any reflective stuff on them to help a driver see a unit signal. maybe the number plate?
 

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