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42424 - New Build Fowler Tank

Discussion in 'Steam Traction' started by steam_mad, May 21, 2015.

  1. MellishR

    MellishR Part of the furniture Friend

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    The only thing possibly wrong with them was their ride on less-than-ideal track. Now that a lot more is known about rail vehicle dynamics, any weakness in that area could be dealt with by the same sort of studies and simulation that have been done for the P2.
     
  2. Bulleid Pacific

    Bulleid Pacific Member

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    W class tank would be nice, too. Interesting development regarding 42424 (an extremely difficult number to remember!).
     
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  3. Jason Cottage

    Jason Cottage New Member

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  4. Jason Cottage

    Jason Cottage New Member

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  5. Gav106

    Gav106 Well-Known Member

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    Doesnt seem to be stopping the Clan! I do agree that there is a lot of GWR projects(beacuse of standardisation i suppose) a lot of LNER newbuilds as there isnt much LNER stuff left at all, not much LMS (only Pat, 42424 and Lnwr george) , 4 standards if you include the 77XXX but even less on the Southern front with only Beachy head so far. Wasnt there a southern boiler sitting at the Avon Valley?? Any good for anything? And the spare boiler that the Urie group own? Would that be any good for anything?

    Gav.
     
  6. 8126

    8126 Member

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    The southern boiler at the Avon Valley is from an Adams T1 0-4-4T (think the bigger brother of an O2 for inner suburban work), but would also be suitable for an Adams A12 'Jubilee' 0-4-2 mixed traffic tender loco. Either would be a fine addition to any preserved line.

    There are actually only as many S15 boilers as S15 chassis; 825 and 841 have only one boiler between them, while 499 and 506 have three, so the most preservation-minded answer is probably 'another serviceable S15'. If somebody did want to create something different then a taper boiler H15 (6 foot mixed traffic version of the Urie 4-6-0 family) would fill a gap.
     
  7. Martin Perry

    Martin Perry Part of the furniture Staff Member Moderator

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    Taper boiler?
     
  8. 8126

    8126 Member

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    Yes. S15 and N15 have taper boilers. All early H15s were parallel boiler, some using the boiler shells from converted Drummond 4-6-0s, new build had a rather better design with a deeper firebox and sloping grate. SR-built H15s 473-8 & 521-4 had taper boilers, and 491 from the early series was converted to free up a spare parallel boiler.
     
    Last edited: May 25, 2015
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  9. Martin Perry

    Martin Perry Part of the furniture Staff Member Moderator

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    Well I never knew that - always thought they were parallel! You learn something new every day - thanks :)
     
  10. John Stewart

    John Stewart Well-Known Member

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    At least 8 hydraulic shock absorbers on the pony truck should do it.
     
  11. Bulleid Pacific

    Bulleid Pacific Member

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    If memory serves, the taper was more noticeable on the lower edge of the boiler profile than on top, which retained an outward appearance of a parallel boiler.
     
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  12. Jamessquared

    Jamessquared Nat Pres stalwart

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    It's very subtle to pick up, but the dimensions in Bradley are a boiler diameter tapering from 5' 1.375" to 5' 5.75" for the Urie N15s; I assume the others were all basically similar as the boiler was interchangeable between N15, S15 and the SR batch of H15s. From the few photos I have where the taper is apparent, it shows it is the front ring only that tapers. Visually, it seems slightly more apparent on locos before they were fitted with smoke deflectors.

    Best diagram I could find:

    [​IMG]

    Tom
     
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  13. Jamessquared

    Jamessquared Nat Pres stalwart

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    Or better track - they ran at up to 80mph on the ECML with no problem. They were essentially a track-sensitive design.

    (It's less well known as they were never involved in an accident, but the LBSCR L class 4-6-4Ts had a similar tendency to roll at speed, with the result that they were modified to place a very large capacity well tank between the frames; the side tanks were then adjusted to only hold a very small amount of water, but they retained their full length and height purely for aesthetic purposes. I suspect that they were also track-sensitive, rather than being an inherently unstable design).

    Tom
     
  14. 8126

    8126 Member

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    The general arrangements in Bradley show it as being on the top of the front ring, with the underside parallel. As @Jamessquared says, it's quite subtle.
     
  15. dhic001

    dhic001 New Member

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    31806 was built as one, so could always be back converted. Its currently has the BR period front end frames and cylinders, but that could be changed too. So to restore it to river condition it would need ne front end and cylinders, new back end of frames and drag box, new rear bogie, tanks and bunker. oh, and an owner willing to let it be done, and lots of money....
    Would love to see it happen though.
    Daniel
     
  16. Bulleid Pacific

    Bulleid Pacific Member

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    Better to build one from scratch and at best borrow a boiler. The frames have already had enough modifications to turn it into a 2-6-0. Whilst welding works wonders these days, it is surely better to begin with structural components with 'zero hours' whenever possible, to borrow a term from the aviation industry.
     
  17. ghost

    ghost Part of the furniture

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    LMS (NCC) No4 undergoing a steam test today - should be back in service soon! Click here for RPSI news page


    [​IMG]
    Photo: Jim Adams

    Hope this is of interest

    Keith
     
  18. LesterBrown

    LesterBrown Member

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    I've just been comparing pictures of the two different cab designs and do think it would be a shame not to recreate one with the original type cab. Nicer looking and much more distinctive compared with surviving 2-6-4Ts.
     
  19. andalfi1

    andalfi1 Member

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    Lets build 2 then !!! :D
     
    Last edited: Jun 1, 2015
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  20. andalfi1

    andalfi1 Member

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    Seriously though, all you would need would be a spare set of cab sidesheets with appropriate numbers and hey presto, or is it that simple ?
     

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