February 29, 2016 07:42AM
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Registered: 16 years ago
Posts: 14,589
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Russo Loco Wrote:
-------------------------------------------------------
>
. . . Here's a closeup view of the 610's unique
> trailing truck, SFAIK the only surviving example
> of Will Woodard's original Super-Power design
> from the mid-1920's
. . . the large pads support-
> ing the rear corners of the firebox rest directly
> on the trailing truck, one on each side. The pad,
> shown in the detail shots above, also acts as a
> centering device for the truck - which is hinged to
> the back of the frame that ends just behind the fifth
> pair of drivers - with the drawbar attached directly
> to the rear of the truck. This design caused stress
> on the boiler and firebox with changes in the grade
> and superelevation of the track on curves
; many
> of #610's sisters were later rebuilt with cast trailing
> trucks and frames extending all the way to the rear
> to alleviate this problem.
The following illustration shows the installation of one of these centering supports during the construction of Lima's experimental first 2-8-4, the A-1. It's been flipped horizontally to better match the photos above, and has just a hint of shading added to the top surfaces. The Texas & Pacific 2-10-4s were ordered shortly after the A-1's very impressive test runs, and were nearly identical in overall design except for an additional pair of drivers and about six feet added to the length of the boiler.
The original of the slightly revised drawing above was a scan taken from page 43 of David Weitzman's superb book
'SUPERPOWER, The Making of a Steam Locomotive', winner of the Bronze Medal for Children's Books at the 1989 Leipzig International Book Design Exhibition. Don't let the term "Children's Books" fool you! This volume, filled with wonderful line drawings like the one above, is the detailed story of Will Woodard's development of the modern steam locomotive, told from the perspective of an 18-year-old apprentice at Lima Locomotive Works in 1925 - an era when "apprentice" meant a great deal more than learning to flip burgers at MuckDonald's or Booger-King.
Per William Withuhn of the Smithsonian Institution
:
"Weitzman's gorgeous, superdetailed line drawings turn 'Superpower' into something rare and wonderful . . . A remarkable and powerful achievement."
I couldn't agree more, and highly recommend 'SUPERPOWER' to anyone interested in steam locomotives and a carefully-researched insight into the great amount of effort, experience, skill and strength required to design and build them during the peak of America's industrial age.
-
Russ Sperry
Edited 7 time(s). Last edit at 03/03/2016 11:21AM by Russo Loco.
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