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L’évolution des retards

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On 7 March 2015, the Express and Star reported Andrew McNaughton as saying that HS2 high speed trains would never be late.

TGV PSE delays

TGV PSE delays

However, Systra’s 2011 capacity and reliability technical note for HS2 Ltd suggested that the service would be affected by late running.

Page 61 included a representation of tardiness on the TGV Paris Sud-Est / Mediterranée, but unfortunately the French ’15-minute’ measurement is not directly comparable with British ‘PPM’ practice.

Since HS2 would be more intensively operated than TGV Paris Sud-Est / Mediterranée, the timekeeping and regularity challenge would be greater.

Written by beleben

March 12, 2015 at 10:43 am

Posted in High speed rail, HS2

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2 Responses

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  1. First off, I got a security exeception when trying to download the document. The certificate appears to be an Amazon one!!! I therefore looked at the copy I downloaded a long time ago.

    This is a fascinating document and the conclusions are well worth reading. It throws up lots of issues some of which have probably not been looked at or glossed over. A proper schedule? Did it happen? Clearly there was something wrong with the Delta junction as the entire section of the document was redacted, presumably to save embarassment. I am aware that the east side of the Delta it is now quad track – did this arise because of this report – if so, that must have contributed to the cost increase.

    Andrew McN clearly has his head in the sand and the clouds at the same time. Perhaps with a following wind, lots of luck and fairy dust, the HS2 track and its “captive” trains might come close to being 100% reliable. Of course the captive trains are useless if there is a problem with the HS2 line. The big unanswered question is how to ensure the reliability of trains coming onto HS2 from the classic network. The proposal to run 18 trains per hour at 360kph (or more) depends on absolute reliability and even then it looks incredibly marginal. A particular problem appears to be the allowable tolerance between two through trains travelling non-stop southbound past Birmingham Interchange where a third stationary train is supposed to be able to accelerate into the gap between them. Any unreliability will tip the whole applecart over.


    March 12, 2015 at 2:43 pm

  2. […] McNaughton – who also seems to favour a closed Shinkansen-type system – but who was reported as saying that HS2 high speed trains ‘would never be […]

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