HST Speed Limit sign at Ashurst New Forest

Discussion in 'UK Railway Discussion' started by dorsetman, 16 Nov 2011.

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  1. dorsetman

    dorsetman Member

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    A large HST speed limit sign has appeared at Ashurst (New Forest). HSTs haven't run through there for many years. Are Arriva X-Country planning to run HSTs through to Weymouth during the Olympics?
     
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  3. michael769

    michael769 Established Member

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    I believe that the "HST" limit also applies to other types of trains including the likes of cl170s, Voyagers and pendos.
     
  4. Mojo

    Mojo Administrator Staff Member Administrator

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    From the Rule Book Module SP, HST is: class 91 locomotive with mark 4 vehicles and DVT/168/170/171/175/180/220/221/222/253/254/373/390
     
  5. DarloRich

    DarloRich Veteran Member

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    didnt know they were still called 253/254 units! (should we add 255?)
     
  6. TDK

    TDK Established Member

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    Class 67's are also HST speed permitted in certain areas
     
  7. Lee_Again

    Lee_Again Member

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    395 ?
     
  8. jopsuk

    jopsuk Veteran Member

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    Presumably the 395 isn't on the list as there's been no need to add it. North of the Thames they've not ventured outside HS1? presumably if someone did fancy testing one on the ECML (for example) it would be relatively easy to get it added.
     
  9. button_boxer

    button_boxer Established Member

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    Isn't the "HST" list more about how quickly the train can decelerate than how fast it can go or how good its acceleration? I.e. if the limiting factor on linespeed in a particular location is the overall stopping distance then trains with better brakes can be allowed to go faster?
     
  10. jopsuk

    jopsuk Veteran Member

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    It's also about the effect on track- a 185 could probably brake as fast, but allowing them to do HST speeds (up to the unit's own maximum) would cause damage.
     
  11. Schnellzug

    Schnellzug Established Member

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    Wondering why 170s and etc are so classified, but EMUs that are also designed for 100 mph aren't? Is it because of axle loadings?
     
  12. driver9000

    driver9000 Established Member

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    My copy of SP has an amendment from December 2009 that includes 158/159 under HST.

    For some reason they aren't listed in the online copy.
     
    Last edited: 16 Nov 2011
  13. Harbon 1

    Harbon 1 Member

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    I think it is because 253/254s don't have engines under each carriage :)
     
  14. Oracle

    Oracle Established Member

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    Must have a look for the sign. The onyl one I know of is the 90 one the Totton side of the overbridge, on the Up.
     
  15. dorsetman

    dorsetman Member

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    It's also on the up side reading 95 - large sign.
     
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