From: gl4317@yahoo.com   
      
   In article ,   
    Larry Sheldon  wrote:   
      
   > 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?   
      
      
   Maybe a photograph of a Beyer-Garratt someone made from Legos would help?   
      
   https://www.flickr.com/photos/67422568@N04/8062667622/   
      
   The front and rear of the locomotive are essentially just regular   
   locomotive frames.  The pilot wheels are tied to these frames just like   
   they would be if they were separate locomotives.   
      
   Thanks to the exaggerated curves of Lego train track it is possible to   
   see the pilot and trailing wheels have moved relative to the separate   
   frame on the front and rear.  However, they are still tied to those   
   front and rear frames, just as they would be in the standard locomotive.   
      
   There are no wheels at all tied directly to the middle section of the   
   locomotive (At least, there aren't in a real Garratt locomotive.)  The   
   boiler and cab are all on a single frame, which is suspended between the   
   two locomotive frames.   
      
   The concept proved good enough that it was actually adopted for use by a   
   few electric locomotives, and these may show the concept a bit better:   
      
   https://www.flickr.com/photos/24736216@N07/2441531897/   
      
   Notice that the end of the locomotive is a separate frame, and the   
   center body is actually just tied to these above the axle that faces the   
   center of the locomotive.  So, instead of one long frame it actually has   
   one somewhat shorter frame and one very short frames at each end.   
      
   On a Beyer-Garratt, those four wheeled end pieces are instead replaced   
   with an entire 4-8-2 or similar steam locomotive, and the cab and boiler   
   take the place of the middle.   
      
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