According to the description by the California State Railroad Museum
Foundation where engine 4294 is on display, a Mallet it only a Mallet if
it is *both* "articulated" and "compounded" see:
<http://www.csrmf.org/doc.asp?ID=162> which says
---------------------------------------------------------
The cab-forward design worked well on these large articulated
locomotives. An articulated is equipped with two independent sets of
driving wheels, able to follow the rails flexibly. SP No. 4294 is often
incorrectly called a Mallet. Named for its French designer, Anatole
Mallet, the Mallet is not only articulated, but it is also compounded,
meaning the steam is used more than once. The steam goes first to high
pressure cylinders, then to low pressure cylinders. Early cab-aheads on
the SP were Mallets. SP 4294 is articulated, but not compounded, and
thus is not a true Mallet.
----------------------------------------------------------
Chuck Norcutt
Dawid Loubser wrote:
>
>
> http://en.wikipedia.org/wiki/Southern_Pacific_4294
>
> Now, to address another reply to your message, of course this engine
> is a Mallet-type engine!
> Even though it does not use the typical low + high pressure cylinders
> combination, I believe
> that any rigid-frame steam locomotive with one of the sets of driving
> wheels mounted on an
> articulated (swiveling) sub-frame is considered a Mallet.
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|