If you register, you can do a lot more. And become an active part of our growing community. You'll have access to hidden forums, and enjoy the ability of replying and starting conversations.

Nunney Castle

Discussion in 'Steam Traction' started by richard67, Jun 23, 2014.

  1. Jimc

    Jimc Part of the furniture

    Joined:
    Sep 8, 2005
    Messages:
    4,109
    Likes Received:
    4,803
    Occupation:
    Once computers, now part time writer I suppose.
    Location:
    SE England
    Heritage Railway Volunteer:
    No I do not currently volunteer
    Oh indeed it was - the GWR General appendix to the rule book has no less than 6 pages on restrictions on various types of carriage, both within the GWR system and elsewhere. I do think they were slightly less precise about it though. There are some LNER documents at Kew discussing standardising loading gauge dimensions and rules for what stock could be used on which routes, including a letter from one division objecting to the proposals on the grounds that they would prohibit certain stock from running on routes where it had been in use for many years.
     
  2. RAB3L

    RAB3L Member

    Joined:
    Jan 4, 2013
    Messages:
    432
    Likes Received:
    236
    With regard to the aforementioned video, it seems that Nunney is being rebuilt with a three-row superheater! At about 40mins.
     
    26D_M likes this.
  3. Sidmouth

    Sidmouth Resident of Nat Pres Staff Member Moderator

    Joined:
    Sep 12, 2005
    Messages:
    9,961
    Likes Received:
    9,065
    Gender:
    Male
    Location:
    Alderan !
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    I think that one has been mentioned before . be interesting to see what difference that makes to 5029 . Speaking with someone who has driven all the main line castles the description was 5029 was a flyer on a lighter load but never an engine happy slogging a heavy one (5051 was happy as anything with a good load on the drawbar)

    she will be a curious engine with a Hawksworth tender body on collett chassis and a gti boiler . if going for three row you wonder why not go all in a four row along with a double chimney
     
    green five, ragl and 26D_M like this.
  4. marshall5

    marshall5 Part of the furniture

    Joined:
    Oct 26, 2010
    Messages:
    2,429
    Likes Received:
    4,167
    Location:
    i.o.m
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    You mean like 7027 was?
    Ray.
     
  5. bristolian

    bristolian Member

    Joined:
    Jul 25, 2005
    Messages:
    453
    Likes Received:
    193
    Gender:
    Male
    Location:
    Huntingdon. Formerly from Bristol.
    Heritage Railway Volunteer:
    No I do not currently volunteer
    7027 was a single-chimney Castle.
     
    26D_M likes this.
  6. marshall5

    marshall5 Part of the furniture

    Joined:
    Oct 26, 2010
    Messages:
    2,429
    Likes Received:
    4,167
    Location:
    i.o.m
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Oops!
     
  7. 60044

    60044 Member

    Joined:
    Feb 24, 2016
    Messages:
    426
    Likes Received:
    804
    Gender:
    Male
    Location:
    Salisbury
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Does that mean a boiler swap,then? If so, what with?
     
  8. Pete Thornhill

    Pete Thornhill Resident of Nat Pres Staff Member Administrator Moderator Friend

    Joined:
    Jul 24, 2008
    Messages:
    7,683
    Likes Received:
    5,758
    No boiler swap, just modification to the more modern specification. It was all detailed ages ago in one of the magazines (can’t remember which one it was).
     
  9. Jamessquared

    Jamessquared Nat Pres stalwart

    Joined:
    Mar 8, 2008
    Messages:
    27,029
    Likes Received:
    60,977
    Location:
    LBSC 215
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Possibly not a boiler swap, but changing how many rows the superheater has requires at a minimum a new front tube plate, and a new inner firebox tube plate, not to mention requiring casting of a new superheater header (if one isn't available from elsewhere) which is a particularly complicated casting to make. So it is not a small modification.

    Tom
     
  10. Pete Thornhill

    Pete Thornhill Resident of Nat Pres Staff Member Administrator Moderator Friend

    Joined:
    Jul 24, 2008
    Messages:
    7,683
    Likes Received:
    5,758
    Yes indeed it is, if I could remember which magazine and when I’d find what was said but unfortunately cannot. I suppose the way I worded it made it sound simple!!!
     
    Jamessquared likes this.
  11. ghost

    ghost Part of the furniture

    Joined:
    May 29, 2006
    Messages:
    4,151
    Likes Received:
    5,433
    Gender:
    Male
    Location:
    N.Ireland
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    I think I remember reading that article too. I may be wrong but I think the header was coming from 7027
     
  12. RAB3L

    RAB3L Member

    Joined:
    Jan 4, 2013
    Messages:
    432
    Likes Received:
    236
    If that is correct, it will interesting to see what 4709 has! A row of empty flues?
     
  13. Sidmouth

    Sidmouth Resident of Nat Pres Staff Member Moderator

    Joined:
    Sep 12, 2005
    Messages:
    9,961
    Likes Received:
    9,065
    Gender:
    Male
    Location:
    Alderan !
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    it may be the case that a boiler swap may have been a better idea than major surgery to upgrade 1 and then unused flues if whatever superheater a 47xx had is fitted on 4709 . the way the night owl is being built just feel wrong to me
     
  14. RAB3L

    RAB3L Member

    Joined:
    Jan 4, 2013
    Messages:
    432
    Likes Received:
    236
    They would have to put something in the flues, otherwise it won't steam very well. It might be more sensible to obtain a superheater header compatible with the boiler?
     
    Last edited: Nov 2, 2024
  15. Hermod

    Hermod Well-Known Member

    Joined:
    May 6, 2017
    Messages:
    1,058
    Likes Received:
    299
    Gender:
    Male
    Location:
    Klitmoeller,Denmark
    Heritage Railway Volunteer:
    No I do not currently volunteer
    Is superheating advantageus on less than 10km trips in Preservation Land?
     
  16. Jamessquared

    Jamessquared Nat Pres stalwart

    Joined:
    Mar 8, 2008
    Messages:
    27,029
    Likes Received:
    60,977
    Location:
    LBSC 215
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Not particularly - but blanking off the superheater in a boiler that was designed to be superheated gives you the worst of all worlds, since you lose heating surface by having reduced number of tubes, and the draughting gets mucked up because all the designed ratios get disrupted, and the hot gases preferentially go through the flues (without much surface area) rather than the tubes.

    Tom
     
  17. Hermod

    Hermod Well-Known Member

    Joined:
    May 6, 2017
    Messages:
    1,058
    Likes Received:
    299
    Gender:
    Male
    Location:
    Klitmoeller,Denmark
    Heritage Railway Volunteer:
    No I do not currently volunteer
    OK but if firebox frontplate of cupper has to be changed anyway?
    Smokebox tube plate is made of cheap steel.
    Chapelon argued that some % of the cylinder efficiency loss, when not superheating ,can be recovered by more small tubes giving better boiler efficiency..
     
    Last edited: Nov 1, 2024
  18. 60044

    60044 Member

    Joined:
    Feb 24, 2016
    Messages:
    426
    Likes Received:
    804
    Gender:
    Male
    Location:
    Salisbury
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Is
    Is Nunney Castle expected to do many trips less than 10Km then?
     
  19. craigy

    craigy New Member

    Joined:
    Jun 14, 2006
    Messages:
    41
    Likes Received:
    18
    Gender:
    Male
    Location:
    Louth
    Heritage Railway Volunteer:
    No I do not currently volunteer
    I think that was aimed at the Owl rather than Nunny.
     
  20. ianh

    ianh Member

    Joined:
    May 10, 2006
    Messages:
    329
    Likes Received:
    188
    Occupation:
    Farmer -
    Location:
    Brecon In Wettest Wales
    I would think that 5029s overhaul had been planned, specified and started before the situation with 7027 changed at the GCR..... with the benefit of hindsight things might have been done differently.....
     

Share This Page