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Thread: Trailing Truck

  1. #1
    Join Date
    Feb 2005
    Location
    Kimball, Michigan
    Posts
    1,340

    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.
    Mechanical Engineers build weapons. Civil Engineers build Targets....When the guy at the door said, "Alcohol, Tobacco and Firearms," I naturally assumed it was a delivery! The first lie voids all dialog. "From my cold dead hand!" C. Heston

  2. #2

    Default

    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.

  3. #3
    Join Date
    Jul 2005
    Posts
    2,619

    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.
    Bill Shields
    Living proof that just about anybody can build a working loco...

  4. #4
    Join Date
    Jul 2006
    Posts
    25

    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

  5. #5
    Join Date
    Feb 2005
    Location
    Kimball, Michigan
    Posts
    1,340

    Default

    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.
    Mechanical Engineers build weapons. Civil Engineers build Targets....When the guy at the door said, "Alcohol, Tobacco and Firearms," I naturally assumed it was a delivery! The first lie voids all dialog. "From my cold dead hand!" C. Heston

  6. #6
    Join Date
    Jan 2006
    Location
    Downeast Maine
    Posts
    828

    Default

    typical of what is under the WATO locomotives of australia.
    Attached Images Attached Images
    Trying to find work to pay for projects, sigh.
    Equipment Owned: Enco 12x36 Geared Lathe
    Working on 1952 John Deere 60 (my new people mover)
    Wanted: Half size steam tractor.

  7. #7
    Join Date
    Jul 2006
    Posts
    25

    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

  8. #8

    Default

    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

  9. #9
    Join Date
    Feb 2007
    Posts
    1

    Default

    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

  10. #10
    harlock Guest

    Default

    Here's some pictures of our Chloe trailing truck:

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

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