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  1. ptreanor

    Major Signalling Loss at Sheffield (10/02/2024)

    Many cables still have to be electrically conductive for supplying power etc. Fibre cables cannot do this.
  2. ptreanor

    How are speed limits set?

    That's one of factors. 1707377933 Both of these factors are taken into account. The distance between the first caution (yellow) aspect and the associated stop signal should not be less than service (normal) braking distance.
  3. ptreanor

    How are speed limits set?

    OK, let's be pedantic. To run a single captive train at any speed does not require a signalling system but that wasn't my point. I'm a signalling engineer by the way...
  4. ptreanor

    How are speed limits set?

    That's not how signalling works...
  5. ptreanor

    How are speed limits set?

    Braking distances. The right to speed is dictated by the ability to stop!
  6. ptreanor

    Failure to lower pantograph

    Eurostars change from 25kV HSL to 25kV ET (and vice versa) on the move nesr Westenhanger. This involves lowering and raising the pan. Similar process in France and in Belgium.
  7. ptreanor

    Station announcer phraseology no longer used

    Heard today at Stratford: "The train is delayed due a fault on the train in front of this one" Sounds very clumsy, surely "....preceding train" would be better!
  8. ptreanor

    HS1 Closed - Eurostar

    Class 92s are not equipped with KVB. TVM 430, AWS & TPWS only.
  9. ptreanor

    Rail projects in the Levelling Up Fund

    It's absolutely laughable that the purposed service is referred to the "West Country Metro" (or something like that). My understanding of the term "Metro" in transport applications is for a high frequency, urban and (usually) electric service. Not an hourly inter-urban service formed with...
  10. ptreanor

    Is the chord that links HS1 towards Waterloo still in use?

    Yes, class 92 locos can work the extent of HS1 but not into St Pancras. In reality, they only work as far as Ripple Lane (Dagenham).
  11. ptreanor

    Is the chord that links HS1 towards Waterloo still in use?

    KVB (like TPWS) is always active on-board so there isn't the need to automatically arm it or disarm it. TVM IS automatically armed and disarmed by "ITL" loops in the track. Class 92 locos use "APC" magnets mounted on the sleeper ends to check that the TVM has armed, in lieu of KVB (the APC...
  12. ptreanor

    Is the chord that links HS1 towards Waterloo still in use?

    I repeat, class 92 locos are not equipped with KVB (only AWS, TPWS & TVM430) and they are not permitted into the train shed at St Pancras. Eurostar (and other TGV types) use KVB to check the operation of TVM once armed and not to arm it initially.
  13. ptreanor

    Is the chord that links HS1 towards Waterloo still in use?

    The Class 92 locos are NOT equipped with KVB train protection.
  14. ptreanor

    Is the chord that links HS1 towards Waterloo still in use?

    The "Waterloo Connection" runs between Southfleet Juncton on HS1 and Fawkham Junction on the Chatham Main Line, it largely follows the route of the old Gravesend West Branch and it is still open (but is seldom used). It is electrified with 25kV catenary with cab signalling at the HS1 end and...
  15. ptreanor

    Most exhilarating station approach

    Going from below ground level to above ground level whilst doing 270k alongside Ashford International Station takes some beating...
  16. ptreanor

    Why is the French name for Brussel-Zuid not Bruxelles-Sud?

    This is my understanding. Midi equates to south, that is where the sun appears in the sky at midday. Simples!
  17. ptreanor

    Crossrail opening delayed (opening date not yet known)

    But my original point was that the Crossrail YouTube video seemed to be over overplaying TPWS/AWS/CBTC integration rather than focusing on the real issues which appear to be related to other systems integration within the core section.
  18. ptreanor

    Crossrail opening delayed (opening date not yet known)

    Didn't TfL choose CBTC because they felt that ETCS hasn't demonstrated sufficient maturity? The system integration issue seems (IMHO) to be a bit of a red herring when one considers that the initial service through the tunnel section only operates between Abbey Wood and Paddington low level...
  19. ptreanor

    Crossrail opening delayed (opening date not yet known)

    There is no doubt that required multi-system integration is complex but I do get the impression that it's being a little overplayed in order to manage expectations. Transitioning from one signalling system to another is not new to the UK, Eurostars and Javelins have been doing it for years and I...
  20. ptreanor

    Should Class 800 be ordered for the Cross Country franchise?

    But that makes it a monopoly which is my point....

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