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Cambrian line signalling

You are here: Home > Forum > Miscellaneous > The real thing (signalling) > Cambrian line signalling

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Cambrian line signalling 22/10/2024 at 11:33 #158936
clive
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I don't want to talk about the causes of last night's crash until we actually know what happened. But I do have one question.

I thought the entire line was ERTMS everywhere west of the junction at Shrewsbury. However, a witness has reported the train passing a signal unable to stop. Am I wrong?

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Cambrian line signalling 22/10/2024 at 11:49 #158938
Steamer
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The whole line is ERTMS, for 'signal' read 'block marker'.
"Don't stress/ relax/ let life roll off your backs./ Except for death and paying taxes/ everything in life.../ is only for now." (Avenue Q)
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Cambrian line signalling 22/10/2024 at 11:52 #158940
TUT
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I'm not aware of any signals at Talerddig either

https://www.flickr.com/photos/llangollen_signalman/37333107380/

Unless the witness is seeing in their mind's eye FRLs on the blocks in the URS I would imagine the red signal referred to is one of those that trains are always being held at according to PA announcements, whether it's a semaphore, a stop board, a block marker or an actual red signal.

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Cambrian line signalling 22/10/2024 at 17:49 #158941
jc92
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3681 posts
clive in post 158936 said:
I don't want to talk about the causes of last night's crash until we actually know what happened. But I do have one question.

I thought the entire line was ERTMS everywhere west of the junction at Shrewsbury. However, a witness has reported the train passing a signal unable to stop. Am I wrong?
Is this a case of Chinese whispers, where the train has passed a block marker without a movement authority (I.e. a SPAD) but explaining that to the public is complicated compared to "passed a red signal" and the witness has then gone from there?

"We don't stop camborne wednesdays"
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Cambrian line signalling 22/10/2024 at 18:10 #158942
TUT
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520 posts
jc92 in post 158941 said:
clive in post 158936 said:
I don't want to talk about the causes of last night's crash until we actually know what happened. But I do have one question.

I thought the entire line was ERTMS everywhere west of the junction at Shrewsbury. However, a witness has reported the train passing a signal unable to stop. Am I wrong?
Is this a case of Chinese whispers, where the train has passed a block marker without a movement authority (I.e. a SPAD) but explaining that to the public is complicated compared to "passed a red signal" and the witness has then gone from there?
Obviously I don't know which witness statement clive was referring to, but for example this BBC News article has the following

Quote:
Anthony Hurford, a passenger on the Shrewsbury-bound train, said he felt "pretty shell-shocked".

[...]

"He [the driver of the other train] tried to stop at the lights. At the top of the hill there's a signal that I guess would have been a passing place and for whatever reason the train wouldn't stop.

https://www.bbc.co.uk/news/articles/c5y0yg7m8meo

Last edited: 22/10/2024 at 18:10 by TUT
Reason: None given

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Cambrian line signalling 22/10/2024 at 19:59 #158945
clive
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2780 posts
TUT in post 158942 said:

Obviously I don't know which witness statement clive was referring to, but for example this BBC News article has the following

Quote:
Anthony Hurford, a passenger on the Shrewsbury-bound train, said he felt "pretty shell-shocked".

[...]

"He [the driver of the other train] tried to stop at the lights. At the top of the hill there's a signal that I guess would have been a passing place and for whatever reason the train wouldn't stop.

https://www.bbc.co.uk/news/articles/c5y0yg7m8meo
Yes, that's the one.

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Cambrian line signalling 23/10/2024 at 08:11 #158946
kbarber
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1736 posts
An RAIB press release states that the collision occurred approx. 800 metres west of Talerddig loop, at a speed of approximately 15mph. It goes on to say:
"RAIB’s initial inspection of the track on approach to the point of collision found evidence that wheel/rail adhesion was relatively low, suggesting that the train may have entered into wheel slide when braking. This will be an area of ongoing investigation."

The 'signal' referred to is indeed a block marker not a light on a stick or an uppy-downy thing.

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Cambrian line signalling 23/10/2024 at 11:32 #158947
moonraker
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365 posts
This was my first thought. Having been involved in an accident at Slough with a Turbo 30 years ago this year in November. Thoughts are with everybody involved
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