From: ce11son@yahoo.ca

On Mon, 19 May 2014 11:43:55 -0500, Larry Sheldon
 wrote:

>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?
>
The whole lot behaves much the same as two tank locomotives coupled
back-to-back, save for the cab/boiler doing the coupling via the
pivots.

>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.
>
I also tripped over this page :-
http://www.cabbagepatchrailway.co.uk/articulated.html
so now I know what the difference is between a Garrett and a Mallett.

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