Would a class 25 be capable of hauling an HST?

Discussion in 'Traction & Rolling Stock' started by PaxmanValenta, 28 Apr 2015.

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  1. PaxmanValenta

    PaxmanValenta Member

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    Would a class 25 be able to pull an 8 car HST set if it were needed at a reasonable speed like 80mph (without gradients). I'm not sure if the class 25 only uses vacuum braking and steam heating so may not be compatible with the HST electrics and brakes etc. Can anyone advise?

    Thanks
     
  2. 455driver

    455driver Veteran Member

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    A dual braked (air and vacuum) 25 could haul a HST but not at 80mph.

    Any ex BR loco fitted with air brakes can haul a HST, it gets more complicated where locos are fitted with swing head buckeyes because the bar wont fit on the coupling hook.

    The steam heat bit wont come into it because of the HSTs 3 phase electric heat, if both power cars are switched off then no air con.
     
    Last edited: 28 Apr 2015
  3. kermit

    kermit Member

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    It might make it up to 80mph on a downhill gradient. But if it came to a halt on an uphill and had to restart, you wouldn't want to bet on its chances.

    All in all, not the first choice for "Thunderbird" duties. Better than an 08.
     
  4. Polarbear

    Polarbear Established Member

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    Having been hauled by a few "rats" (25's) in my time, I think it's safe to say that one would struggle to maintain a decent speed hauling a 125 2+8 formation. They were fine on loads up to 6 or 7 mk1's & of course, had no ETH to sap power.

    I seem to recall that some cl 25's were dual braked?
     
  5. ac6000cw

    ac6000cw Established Member

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    Yes, they were.

    Haul an HST set - yes, no problem (it's around 500 tonnes - a pretty lightweight freight train), but it might struggle to reach and maintain 80 mph on level track due to lack of power.

    Actually the low speed tractive effort of a 25 is a bit higher than two HST power cars, so it should manage the hill climbing almost as well, just somewhat more slowly....
     
  6. alexl92

    alexl92 Established Member

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    I'm intrigued to know what prompted the question from the OP? :)
     
  7. PaxmanValenta

    PaxmanValenta Member

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    I'm thinking of writing a book. But need to get technical facts correct :)
     
  8. DownSouth

    DownSouth Established Member

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    Or you could take the 'any publicity is good publicity' route and make sure that the technical details are not quite correct, so that certain members of this forum will talk about your book at any given opportunity :D

    I presume that you're considering a fiction book, given that you're consulting an internet forum. If so, take it easy on the tech details when they aren't absolutely essential, always remember that less is more if you don't want them to be a distraction.
     
  9. The Snap

    The Snap Established Member

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    I thought you were planning a railtour...now that would have been interesting! <D
     
    Last edited: 28 Apr 2015
  10. PaxVobiscum

    PaxVobiscum Established Member

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    He works for Abellio ScotRail? :D
     
  11. ac6000cw

    ac6000cw Established Member

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    Ah, but then you'd need a dual-braked class 27 instead ;)
     
  12. plarailfan

    plarailfan Member

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    This might help :) (not my photo by the way ) http://www.leightonlogs.org/15078625057.jpg The rare sight of 25057 dragging a failed HST with the 1550 Nottingham - St Pancras which was terminated at Bedford, except for railway staff back on July 15th 1986
     
    Last edited: 28 Apr 2015
  13. colchesterken

    colchesterken Member

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    Who would believe it happened. it just goes to show anything is possible on this forum
    well done
     
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