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  #1  
Old 08-14-2008, 03:20 AM
pockets pockets is offline
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Default Trailing Truck

Hey, Gang,
On an 0-4-2, how is the trailing truck mounted, suspended and / or equalized? I've googled 'til I giggled and I'm not having a lot of luck. I'm thinking, primarily, of the small contractor's locomotives.

Thanks,guys,
Greg B.
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Old 08-14-2008, 08:18 AM
Alan Stepney Alan Stepney is offline
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Several choices there.
Some had radial trucks, running in curved guides, but more commonly, the wheels+axle were linked via a triangular frame to a pivot that was fixed to a cross member of the main (loco) chassis.
There would usually be a flat plate on frame & chassis with some form of springing between them. (In a wide variety of ways: so many that whatever you do is almost certain to have been used before.)

To locate the pivot point, there were several formula, the most common being Baldrey's rule.

Whilst all need a pivot (apart from the radial trucks) and some springing, few, in 12" scale, were equalised with the main loco springs and I doubt it would be needed on "our" scales.
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  #3  
Old 08-14-2008, 10:21 AM
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Bill Shields Bill Shields is offline
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Default trailing

then there was the way they did it in early Atlantics - the trailing wheels were just mounted an a frame extension, no pivot, with just a bit of extra lateral clearance...all equalized, but that's it.
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Old 08-14-2008, 11:23 AM
hudson hudson is offline
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Default Trailing truck

Ask the people of:

http://www.lmlr.org.au/locomotives.htm

They have a nice 2' Baldwin 0-4-2T #10533 of 1889 in service

Another site contains 2 photographs of this locomotive:

http://www.australiansteam.com/sugar/baldwin10533.jpg

http://www.australiansteam.com/sugar/baldwin10533a.jpg

regards,
hudson
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Old 08-14-2008, 08:10 PM
pockets pockets is offline
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Thanks to all for your consideration.

Alan,
Baldrey's Rule? Weren't the radial trucks unique to plate frame locomotives?

Hudson,
I have a General arrangement of the Fairymead Sugar engine, from an old Keith Watson article in LS. It doesn't show any detail of the truck. Thanks for the links.

Bill,
I'm familiar with those. They are, however, a little more "mainline" than what I'm looking for, but thanks anyway.

Thanks,
Greg B.
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Old 08-14-2008, 08:17 PM
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willy willy is offline
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typical of what is under the WATO locomotives of australia.
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File Type: jpg ponytruck.jpg (11.5 KB, 34 views)
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  #7  
Old 08-14-2008, 09:52 PM
hudson hudson is offline
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Default Trailing truck

Baldwin 6-xx C: (= 0-4-2) with rear tank

The catalogue says on page 49:

... . In this type the driving-wheels are equalized together, and the truck is
centre bearing,with swinging bolster and radius bar....
The distribution of weight is as nearly perfect as possible, and the principal
weight is carried on equalizing levers midway between the driving-wheels. ...
The pony truck carries the weight of the water and fuel, with part of the
weight of the overhanging fire-box.

but this applies also to Baldwin 6-xx with saddle tank,except that
carries water does not apply to the rear truck.

This catalogue (1885) is available at http://www.archive.org/index.php

The file name is illustratednarro00baldrich.pdf

A drawing of a saddle tank loco can be found at:

http://www.ironhorse129.com/Projects...ages/pokaa.jpg

You will find several photographs under Projects as well.

hudson
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Old 08-14-2008, 10:28 PM
Alan Stepney Alan Stepney is offline
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Greg, Baldrey's rule will apply no matter what type of frame.
(Or one of the other rules for determining the pony position.)

Radial trucks were used on plate frames, as you say. I am sure I have read about them being used on bar frames too, but might be wrong about that.


You will also find some information on the topic on Giles' website:
http://www.gilesfavell.seriouslyinte...es%20index.htm
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  #9  
Old 08-15-2008, 04:20 PM
Fairport Fairport is offline
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Pockets: Take a look at Gene Allens Chloe's trailing truck design and mounting. It is an almost perfect example of a 1880's thru 1920 era Baldwin 0-4-2T trailing truck. It is easy to build and works great if you follow Gene's prints. I used needle bearings in mine, but not necessary.
Thanks Alan Francis
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  #10  
Old 08-15-2008, 06:51 PM
harlock
 
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Here's some pictures of our Chloe trailing truck:

http://www.mojaveserver.info/gallery...oe/trailtruck/
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