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Locomotive Front End Designs

Discussion in 'Steam Traction' started by ragl, Feb 19, 2016.

  1. Jamessquared

    Jamessquared Nat Pres stalwart

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    Yes, but the point of evolution is that the vast majority of differences convey no advantage, or a positive disadvantage, and therefore are not selectively propagated - the differences that convey an actual advantage are rare, but they are the only ones seen in retrospect (for example, in the fossil record).

    Tom
     
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  2. class8mikado

    class8mikado Part of the furniture

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    Think it can be demonstrated that a singular mutational difference that occurs in generation one must be sufficiently advantageous and/or sufficiently innocuous to carry forward into subsequent generations...
     
  3. 30854

    30854 Part of the furniture

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    Which is why Terriers survive in double figures whilst Leader is no more than a memory! (Does the NRM archive count as a fossil record for our purposes?) :)

    Of the evolutionary record, I'd just note that the way 'new' fossilised species regularly turn up, we simply have to acknowledge just how incomplete our knowledge is.
    ... which goes some considerable way to explaining why I'm a bit mystified about the rationale behind the Churchward 'County' project .... ;)

    Bring back the trilobites!
     
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  4. Hermod

    Hermod Member

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    The GWR locomotive can be made as half a County and half a City of Truro that went 100 mph on a sunny day.
    Compound of course.
    Distance between outside high pressure and indside low will not be much bigger than the Truro distance and cirka half the swaying County ditto.
    Will only look od directly in front and can cash two times as many film jobs.
     
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  5. flying scotsman123

    flying scotsman123 Part of the furniture

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    Half of something, half of something else, and of course all something it never was. I was currently unaware of the huge gap in the film market for GWR 4-4-0s, let alone 2...
     
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  6. 30854

    30854 Part of the furniture

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    The whole shebang seems predicated on what's the best fit for a particular niche slot. A role which might be filled here (say) by a mammal adapted to best exploit circumstances could as easily be filled on a remote island by a bird, reptile or even a crab species.

    Another factor is the stability which goes with being an isolated community, where competition from invasive species is minimal. On Mauritius, the flightless dodo thrived until Europeans turned up ..... on the Isle of Man, much the same applies to the greater and lesser Beyer Peacock 2-4-0t!
     
  7. Jimc

    Jimc Part of the furniture

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    One might also note the phenomenom known as Island dwarfing...
     
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  8. 30854

    30854 Part of the furniture

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    Bob only knows what gauge was originally earmarked for the line on the Azores then! :D
     
  9. Jamessquared

    Jamessquared Nat Pres stalwart

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    Ah, that would explain New Zealand ...

    Tom
     
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  10. Copper-capped

    Copper-capped Active Member

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    Colloquially known as "small chufferitis".
     
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  11. JJG Koopmans

    JJG Koopmans Member

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    Earlier post 153. I have been asking around. There is an article on the Selkirk tests in the U.S. Magazine "Central Headlight" Vol XIII, no. 4 fourth quarter 1983. There is a patent : US no 2226052. I could not access it through the US Patent Office
    website, Google Patent search supplied the detailed patent. Imho bad tests, changing two items at the same time, result longer chimney and chimney to orifice diameter ratios representing expelled product to steam, earlier chimneys too small.
    They preferred round orifices with cross-bars due to the incomparable test results of other orifices.
    Kind regards
    Jos
     
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  12. Steamage

    Steamage Part of the furniture

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    Wasn't "Trilobite" an early broad gauge single? Cue the next GWS new-build project... ;-)
     
  13. Jamessquared

    Jamessquared Nat Pres stalwart

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    Trilobite would be a good name for a GWR loco: a successful initial design that then continued without change for the next 270 million years until wiped out by rapid, mass extinction to leave just a few old fossils to show what once was ...

    Tom
     
  14. sir gilbert claughton

    sir gilbert claughton Active Member

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    there is no "Tribolite" in the list of" british steam loco names " so I doubt if there was one
     
  15. 30854

    30854 Part of the furniture

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    Well there jolly well ought to be .... "Ammonite" too .... in fact, we've an entire newbuild theme to drive Starkey to despair ..... we could go from single vanished species all the way up to global extinction events.

    Aren't I a little ray of sunshine? :)
     
  16. Copper-capped

    Copper-capped Active Member

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    It could be worse: unsuccessful initial design, then rebuilt every decade or so until kind of successful for another decade, then wiped out by rapid mass extinction. Let's call it...."Southernobite". :p
     

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