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B.R Standard Locomotives 9F 2-10-0 : Crosti boilers 92020-92029

Discussion in 'Photography' started by neildimmer, Sep 25, 2018.

  1. neildimmer

    neildimmer Member

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    British Railways Standard Class 9F steam locomotives Nos 92020-9 were experimentally built with Franco-Crosti boilers, thus forming a subclass. All ten were built in 1955 at Crewe Works.
    The Franco-Crosti boiler took the form of a single cylindrical water drum running along the underside of the main boiler barrel; the standard chimney at the front was only used during lighting-up, in normal working the gases went through firetubes inside the preheater drum that led to a second smokebox situated beneath the boiler from which there emerged a chimney on the right-hand side (fireman's), just forward of the firebox.
    In the event, the experiment did not deliver the hoped-for benefits, and efficiency was not increased sufficiently to justify the cost and complexity. Moreover, conditions were unpleasant on the footplate in a cross-wind, this in spite the later provision of a small deflector plate forward of the chimney. These problems led to the subsequent sealing off of the preheater drum, over the period 1959-1961, and the locomotives were then worked conventionally. As a result of this, there was a reduced ability to generate steam, and so their power classification was reduced from 9F to 8F.
    All were fitted with the BR1B-type 4,275 imperial gallons (19,430 l) tender.
    The locos as originally built with the Crosti boiler working
    92020 Wellingborough 10th April 1960
    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-nbRXtH8
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92024 Cricklewood 20th July 1955
    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-4FNMzRv
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92024 Wellingborough 2nd Oxtober 1956
    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-5pqd2tt
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92026 close up of Crosti gear
    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-ZHPjcM3
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92027 Cricklewood shed 28th April 1956
    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-Qq4VtDC
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92028 Kettering shed still with Franco Crosti system working
    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-nRbx3VJ
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92028 (still working in as built Crosti mode
    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-LnpmsSP
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com


    converted back to standard steaming version


    92024 Wellington 22nd July 1963

    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-6K8SzxN/A
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com


    92024 Crosti boilered 9F Leagrave June 1962

    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-kdSw7hg
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com


    92026 York

    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-F3f43qt
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92029 Bristol June 1963


    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-DcBvWn9
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92029 unknown location

    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-3DkPhgv
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com

    92020 Birkenhead


    https://railway-photography.smugmug.com/BRStandardSteam/BR-Standard-9F-2-10-0-92/9202092029-FrancoCrosti-Built-/9202092029/i-Qmv2Hvd/A
    [​IMG]
    92020-92029 - Railway-Photography

    railway photographs from the last 100 years
    railway-photography.smugmug.com


    Neil
     
  2. oddsocks

    oddsocks Member

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    Neil. The pre-heaters were not just "sealed off", they were removed completely, if you look at the first pic of the modified 92024 you can see daylight under the boiler, ditto on the one of 92026 at York.
     
  3. Fred Kerr

    Fred Kerr Part of the furniture

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