From: ce11son@yahoo.ca   
      
   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   
      
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