From: lfsheldon@gmail.com   
      
   On 5/19/2014 10:11 AM, Charles Ellson wrote:   
   > On Sun, 18 May 2014 22:20:53 -0700, Glen Labah    
   > wrote:   
   >   
   >> In article ,   
   >> Larry Sheldon  wrote:   
   >>   
   >>> I have been studying all the pictures you nice people have pointed to   
   >>> and I for the life of me see were the articulation "hinges" are nor how   
   >>> they "work".  From the pictures, it looks like any articulation will   
   >>> have one or more drivers fouling the boiler chassis.   
   >>   
   >>   
   >> It really isn't very obvious, but on the larger Garratt locomotives the   
   >> frame split is almost always above the 3rd driving axle.  Then, the   
   >> upper body may or may not have some overhang one way or the other.   
   >>   
   >> It is probably best to see a model of one run, as that gives you sort of   
   >> an above the model look as it goes around curves.  This is the best I   
   >> could find so far, of a British 2-6-0+0-6-2:   
   >>   
   >> http://www.youtube.com/watch?v=mYlM-9j1AQI   
   >>   
   > "Hinge" and "frame split" could be slightly misleading, they don't   
   > bend in the style of e.g. some double-section electric and diesel   
   > locomotives but instead involve overlapping sections. There are three   
   > main sections - two engines with the cab/boiler suspended between and   
   > overhanging both of them.   
   > The second and third rows of this drawing show the pivot points on a   
   > SAR 400 class :-   
   > http://www.johnnyspages.com/rail_dittys_files/garratt_diagram.gif   
   >   
      
   OK.  I think I had the pivot thing figured out (vice "hinge") bout it   
   didn't (and still doesn't!) look like that driver can swing far enough,   
   but I guess it does.  I assume that the bogey (pilot?  ??) next to the   
   driver under the boiler (when provided) swing with the drivers?  Seems   
   like it must else why have it?   
      
   Thanks a lot.   
      
   I can't believe I had never heard of them before.  I've long said it was   
   a bad day that I don't learn something--this has been a real treat.   
      
   --   
   Idioten aangeboden. Gratis af te halen.   
   h/t Dagelijkse Standaard   
      
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