4-8-8-4 Big Boy Locomotives by Richardphotos
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Description
they moved the Big Boy out of the museum getting ready to move it Sunday. Sunday is the only day that they can move because there is no local passenger train service
http://www.museumoftheamericanrailroad.org/Exhibits/CollectionOverview/tabid/62/agentType/View/PropertyID/18/Default.aspx
http://www.steamlocomotive.com/bigboy/
During the late 1930s, the Union Pacific often
used helpers to move trains from Ogden to Wahsatch.
The UP wanted to simplify this move so they asked
their "Department of Research and Mechanical Standards"
(DoRMS) to design a locomotive
that could pull a 3600 ton train unassisted over the
1.14% grade of the Wahsatch.
The designers determined that to pull a 3600 ton train,
a tractive effort of 135,000 lbs would be needed.
Assuming a factor of adhesion of 4.0, the weight on
drivers would have to be 4.0 * 135,000 = 540,000 lbs.
Given an axle loading of 67,500 lbs each, this would
require 8 drivers or an x-8-8-x wheel arrangement.
The designers agreed upon the 4-8-8-4 design. Next,
the horsepower and cylinder sizes were computed based
on 300 psi boiler pressure. Although they weren't planning
to pull these freight trains at 80 MPH, the DoRMS designed
them for 80 MPH in order to have a sufficient factor of
safety built into the design. What resulted is considered
by many to be the most successful articulated steam locomotive
ever built. 4000 was delivered to Omaha at 6PM, September 5, 1941.
The 25 Big Boys were built in two groups. The first group,
called "class 1", were built starting in 1941. They were
numbered 4000-4019. The second group, "class 2", were built
in 1944. They were numbered 4020-4024. The last revenue freight
pulled by a Big Boy was in July of 1959. Most were retired in 1961.
The last one was retired in July of 1962. As late as September, 1962,
there were still four operational Big Boys at Green River, WY.
The total mileage of each of the Big Boys from class 1 were
roughly the same -- 1,000,000 miles. 4016 had the lowest mileage
-- 1,016,124. 4006 had the highest mileage -- 1,064,625. Of the
second group, 4024 had the highest mileage -- 811,956.
Comments (38)
Fascinante, captura excelente meu amigo. Obrigado pelo texto, aplausos (5)
Interesting information and shot!
Cool & beautiful old Engine!
Wow...that's some steam engine... Fantastic fisheye effects...
What a fabulous train! I more or less secretly admire steam trains and bewail that I only once had the chance to travel in one in regular service. I was about 3 years old...
Great Locomotive!!!!!!
Amazing!! Thanks for including so much wonderful info!! Really appreciated!!
cool shot!! love the pano.
Sensational capture of it Richard, and I very much enjoyed the detailed history you provided.
wow cool history and shot
That is one big engine, outstanding capture!!!!!!!!!!!!!
Now I understand the number designation - very cool capture Richard
Very beautiful shot and thanks for the infos:
A great capture!
wow, nice shot
Excellent photo and info.
cool capture Richaard
I always liked the big boy locos. It's neat that it looks so good.
Excellent panoramic capture, superb engine !
Fantastic shot, Richard!!
A superb shot and I really appreciate all the information too!
Exellent shot.
Beautiful Locomotive Nice picture!!!!!!!!!!!!
Marvelous old engine... fantastic capture also
Magnífica foto Richard,fantástica locomotiva ela é muito grande,obrigado pela informação.++++++++++5
amazing shot
AMAZING WORK!
Great historic for this one my friend so nice ((5++))
Those are massive locomotives. the tenders are also huge.
fantastic image,great done