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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