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2364
Abstract
href="https://en.wikipedia.org/wiki/4-6-6-4">4–6–6–4</a> arrangement,
Speeds over 100mph
regularly achieved,
Four wheels in
leading pilot truck to
guide locomotive,
Two sets of
six driving wheels and
four trailing wheels to
support massive firebox,
Each set of driving wheels
driven by two steam cylinders.</p><p id="47a8"><a href="https://en.wikipedia.org/wiki/Union_Pacific_3985">Union Pacific 3985</a>
Challenger built
July 1943 by
American Locomotive Co for
Union Pacific Railroad,
<a href="https://en.wikipedia.org/wiki/Union_Pacific_3985">№3985</a> is one of only two
Challengers still in existence,
Last in service 1957.</p><p id="fd7d">March 1981
<a href="https://en.wikipedia.org/wiki/Union_Pacific_3985">№3985</a> restored
to steaming for
excursion services,
Mechanical problems
stored again in 2010,
April 2022 donated to
Railroading Heritage of
Midwest America (RRHMA),
Intention to restore to
operating condition.</p><p id="95a0">Challengers entered
service in 1936 on
UP’s <a href="https://en.wikipedia.org/wiki/Overland_Trail">main line</a>,
Steepest grade 1.14%
demanded <a href="https://en.wikipedia.org/wiki/Double_heading">double heading</a>,
Limitations led to
development and
introduction of
UP <a href="https://en.wikipedia.org/wiki/Union_Pacific_Big_Boy">Big Boy</a>s in 1941.</p><h2 id="48e9">UP Big Boy 4–8–8–4</h2><figure id="3e18"><img src="https://cdn-images-1.readmedium.com/v2/resize:fit:800/0*Dx7Xlm-DbOL8WWUX.jpg"><figcaption>Union Pacific “Big Boy” 4014. Image was originally posted to <a href="https://en.wikipedia.org/wiki/Flickr"><b>Flickr</b></a> by Shiva Shenoy at <a href="https://flickr.com/photos/40729380@N00/51379761460">https://flickr.com/photos/40729380@N00/51379761460</a>. It was reviewed on 21 February 2022 by <a href="https://commons.wikimedia.org/wiki/User:FlickreviewR_2"><b>FlickreviewR 2</b></a> and was confirmed to be licensed under the terms of the cc-by-2.0.</figcaption></figure>
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</figure></iframe></div></div></figure><figure id="b7d7"><img src="https://cdn-images-1.readmedium.com/v2/resize:fit:800/0*cw1aK5Yz1Gxub33q.jpg"><figcaption>A <a href="https://en.wikipedia.org/wiki/Close-up">close-up</a> of №4014’s <a href="https://en.wikipedia.org/wiki/Running_gear_(rail_transport)">running gear</a> in 2019 passing through Junction City, KS. Picture and caption by <a href="https://www.flickr.com/people/86397788@N06">Acorns Resort</a> from Milford on 20 November 2019. <a href="https://en.wikipedia.org/wiki/en:Creative_Commons">Creative Commons</a> <a href="https://creativecommons.org/licenses/by/2.0/deed.en">Attribution 2.0 Generic</a></figcaption></figure><p id="cb41"><b>Union Pacific Big Boy
</b> simple <a href="https://en.wikipedia.org/wiki/Articulated_locomotive">articulated</a> <a href="https://en.wikipedia.org/wiki/4-8-8-4">4–8–8–4</a>,
Manufactured by ALCO
between 1941 and 1944,
Operated in service
until 1962,
25 Big Boys built to
haul <a href="https://en.wikipedia.org/wiki/Rail_freight_transport">freight</a> over
<a href="https://en.wikipedia.org/wiki/Wasatch_Range">Wasatch Range</a> between
<a href="https://en.wikipedia.org/wiki/Ogden,_Utah">Ogden</a> and <a href="https://en.wikipedia.org/wiki/Green_River,_Wyoming">Green River</a>.</p><p id="7c7f">Big Boy <a href="https://en.wikipedia.org/wiki/Union_Pacific_4014">№4014</a>,
Rebuilt by UP
started 2014
completed 2019 for
150th anniversary of
<a href="https://en.wikipedia.org/wiki/First_transcontinental_railroad">US first transcontinental railroad</a>,
World’s largest and most powerful
operating steam locomotive.</p><p id="f166">UP Big Boy longest engine body of
any reciprocating steam locomotive,
Heaviest reciprocating steam
locomotives ever built,
Engine at 386 US tons,
Tender at 219 US tons,
Big Boy could consume
11 tons of coal and
12,000 gallons of water
in one hour of steaming.</p><p id="f22a">2019 Union Pacific
completed restoration
№4014 and placed it in
<a href="https://en.wikipedia.org/wiki/Excursion_train">excursion service</a>,
Still steaming 2022.</p><p id="fa7c">Blessed be.</p></article></body>
