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Loss of Speed Restrictions data in-cab, Cambrian Line

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Loss of Speed Restrictions data in-cab, Cambrian Line

Unread postby John Webb » Wed Feb 21, 2018 6:39 pm

See https://www.gov.uk/government/news/loss-of-speed-restrictions-on-the-cambrian-line.
During the morning of Friday 20 October 2017, a train driver travelling on the Cambrian coast line in North Wales reported that long standing temporary speed restrictions were not indicated on their in-cab display. As signalling staff at the control centre in Machynlleth investigated this report, they became aware that this failure applied to several trains under their control. The temporary speed restrictions were required on the approach to level crossings so that people crossing the line had sufficient warning of an approaching train.

The Cambrian lines were equipped in 2011 with a pilot installation of the European Rail Traffic Management System (ERTMS), a form of railway signalling. ERTMS removes the need for signals along the track by transmitting data directly to the train. This data is used to display movement authorities and other information such as temporary and permanent speed restrictions, on a screen in front of the driver.
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Re: Loss of Speed Restrictions data in-cab, Cambrian Line

Unread postby steve thompson » Wed Feb 21, 2018 8:47 pm

Are there no line side boards as before ?
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Re: Loss of Speed Restrictions data in-cab, Cambrian Line

Unread postby left » Wed Feb 21, 2018 9:36 pm

Is that an ETCS Level 2 installation?
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Re: Loss of Speed Restrictions data in-cab, Cambrian Line

Unread postby S&TEngineer » Wed Feb 21, 2018 10:20 pm

Regards,
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Re: Loss of Speed Restrictions data in-cab, Cambrian Line

Unread postby Stuart Johnson » Wed Feb 21, 2018 10:32 pm

steve thompson wrote:Are there no line side boards as before ?

No, everything is conveyed through the screen (the DMI, driver machine interface)
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Re: Loss of Speed Restrictions data in-cab, Cambrian Line

Unread postby left » Thu Feb 22, 2018 9:21 am

This seems to be the point:

Subsequent investigation found that the signalling system stopped transmitting temporary speed restriction data after a routine shutdown and restart at around 23:10 hrs the previous evening. The signallers had no indication of an abnormal condition and signalling control centre displays showed these restrictions as being applied correctly.


Which is why when I don’t see a TSR on my DMI who had previously been there for a long time I call the signaller to ask if it’s all right... Since putting in place of TSRs has gone from workers installing boards on the tracks to a signaller inserting pre-planned data to the system, some additional precaution should be taken.
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Re: Loss of Speed Restrictions data in-cab, Cambrian Line

Unread postby Mark Lamb » Thu Feb 22, 2018 12:15 pm

Are TSR's still printed in the weekly notices, so drivers have a hard copy? Or is it a different system nowadays and - on the Cambrian - completely paperless? I might have this wrong, but didn't the notices used to give a date of removal of a TSR, and hence the spate sign if removed early (whatever the DMI equivalent is!)

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Re: Loss of Speed Restrictions data in-cab, Cambrian Line

Unread postby Fast Line Floyd » Thu Feb 22, 2018 12:30 pm

Mark Lamb wrote:Are TSR's still printed in the weekly notices, so drivers have a hard copy? Or is it a different system nowadays and - on the Cambrian - completely paperless? I might have this wrong, but didn't the notices used to give a date of removal of a TSR, and hence the spate sign if removed early (whatever the DMI equivalent is!)

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Mark

Yes still printed.
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