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Steam Dreams 2021

Discussion in 'What's Going On' started by Gladiator 5076, Oct 28, 2020.

  1. mrKnowwun

    mrKnowwun Part of the furniture

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    The flashover can be caused by the loco proximity to earth, it can be caused by steam acting as a conductive conduit, the high pressure steam deflecting the catenary (which can be towards a bridge gantry) the steam blowing debris into a conductive path with the catenary, even (whisper it) a badly loaded tender -

    As for risk from explosive expansion? Shock and surprise causing pax falling or stumbling or dropping things, debris blown into the air, paint chips rust chips and anything loose from the contact areas thrown around etc etc etc. I wouldn't want to be with three feet of a strike by whatever means and neither does network rail or the TOC's want gen public

    And at that point I am off this subject.
     
  2. alts1985

    alts1985 Well-Known Member

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    Mayflower rushing through Welwyn North last night on the return leg having been held at Knebworth to let a late running Aberdeen-King's Cross Azuma overtake. Skip to 7:27!

     
  3. Enterprise

    Enterprise Part of the furniture

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    I think that to be a wise decision!
     
  4. Big Al

    Big Al Nat Pres stalwart Staff Member Moderator

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    That's not because of steam; isn't that water being drawn out the valves due to an overfilled boiler?
     
  5. mrKnowwun

    mrKnowwun Part of the furniture

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    Just how pompous can one person get.
     
  6. Enterprise

    Enterprise Part of the furniture

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    I meant that continuing the discussion served no further purpose.
     
  7. RalphW

    RalphW Nat Pres stalwart Staff Member Administrator Friend

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    Looks pretty spectacular, but to surmise an overfilled boiler is making a giant assumption.

    Screenshot (56).png
     
  8. Big Al

    Big Al Nat Pres stalwart Staff Member Moderator

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    The only way that water can escape from the valves and drift down onto the platform as can be seen in the video is if the boiler has been overfilled. But I agree that it may not have been the water causing the flash over. A good chance though.
    Ask @torgormaig
     
  9. Johnb

    Johnb Resident of Nat Pres

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    The only people who would know that are those who were on the footplate. I witnessed a flashover at Stockport in 1967, that was from safety valves blowing
     
  10. FlyingScotsman4472

    FlyingScotsman4472 Member

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    61306 going well through Ruskington station with the returning Lincoln Christmas Market charter.
    LNER B1 at Ruskington copy 2.jpg
     
    ragl, Mick45305, 3ABescot and 2 others like this.
  11. torgormaig

    torgormaig Part of the furniture Friend

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    Ask me? I knoow nothhing.... but I must admit that my first thought when I saw this video was that the boiler was a tad full. However I wasn't there so I cannot say for certain. Flashovers do occur from time to time, and not only with steam locos. There is seldom any drama when it does happen. If the system trip out it come streight back on again. If it trips for a second time (or is it a third time?) then the juice stays off. It is clear to the Electrical Control Office that there is a problem and serious disruption ensues. I do not know of any instance when this has been caused by steam. But please do not regard me as any expert on this matter, and maybe my understanding is all wrong.

    Peter
     
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  12. Jamessquared

    Jamessquared Nat Pres stalwart

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    Isn't all this talk about flashovers from overhead wiring a red herring?

    This sub-thread started (my emphasis):

    Now, I'm not an expert on the modern network, but last time I checked, Winchfield was rather a long way from any overhead wires!

    @Shaggy then followed up with an explanation:

    In other words, the risk being mitigated is the safety valves lifting under a bridge: nothing to do with whether there are or aren't overhead wires. It's simply the risk of being caught, or startled, by the release of steam.

    I'm not a risk analyst, so I'm not going to say whether that is over-reaction or not (though one wonders how people survived the previous hundred and fifty years of crossing bridges). But whatever the perceived risk that has caused the reaction, it is seemingly nothing to do with flashovers or OHLE.

    Tom
     
  13. Shaggy

    Shaggy Well-Known Member

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    You are spot on. The issue was with the safety valve opening under a footbridge. There was no mention of OHLE.
     
  14. richards

    richards Part of the furniture

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    Maybe because of the risk of railway photographers who (based on recent comments) seem to know better and want to challenge or ignore instructions from safety staff?

    It might boost someone's ego to challenge staff about what *they* think they can or can't do. But if the staff have been given a specific job to do (not of their own choice), then following those instructions would help everyone involved and reduce the chance of more draconian measures in the future.
     
  15. hampstead

    hampstead New Member

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    The very similar lattice footbridge at Hook is currently being renovated and repainted, apparently in unchanged form.
     
  16. KristianGWR

    KristianGWR Member

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    Today's run to Oxford passing near Oddington, this afternoon. I hope you enjoy it :)
     
  17. Spamcan81

    Spamcan81 Nat Pres stalwart

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  18. LMarsh1987

    LMarsh1987 Part of the furniture

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    44871 Gliding up Saunderton with ease, not too much from the rear either.
    51735671686_d644875f3d_o.jpg
     
  19. TheModster

    TheModster Member

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    Spamcan81 likes this.
  20. Michelliss

    Michelliss New Member

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    Actually, I thought it was getting quite a shove !
     

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