Union Pacific Big Boy class locomotives

E493346

articulated locomotive class steam locomotive class

The Union Pacific Big Boy class locomotives were massive 4-8-8-4 articulated steam engines built for Union Pacific Railroad, famed as some of the largest and most powerful steam locomotives ever constructed.

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Observed surface forms (1)

Surface form	Occurrences
Union Pacific Big Boy No. 4012	1

Statements (59)

Predicate	Object
instanceOf	articulated locomotive class ⓘ steam locomotive class ⓘ
4014RestorationCompletionYear	2019 ⓘ
boilerPressure	300 psi ⓘ
builder	ALCO Schenectady Works NERFINISHED ⓘ American Locomotive Company NERFINISHED ⓘ
classDesignation	UP class 4000 NERFINISHED ⓘ
configurationType	Whyte notation 4-8-8-4 ⓘ
countryOfOrigin	United States of America ⓘ surface form: United States
cylinderArrangement	simple articulated ⓘ
cylinderCount	4 ⓘ
cylinderSize	23.75 in × 32 in ⓘ
designedFor	long, heavy freight trains ⓘ steep grades ⓘ
designer	Otto Jabelmann NERFINISHED ⓘ Union Pacific Railroad mechanical department NERFINISHED ⓘ
driverDiameter	68 inches ⓘ
engineWeight	about 772,000 lb ⓘ
factorOfAdhesion	about 4.0 ⓘ
firstRunYear	1941 ⓘ
fuelCapacity	approximately 28 tons of coal ⓘ
fuelType	coal ⓘ
historicalEra	World War II era NERFINISHED ⓘ transition era from steam to diesel ⓘ
lengthOverCouplers	about 132 feet ⓘ
maximumSpeed	approximately 80 mph ⓘ
nickname	Big Boy NERFINISHED ⓘ
notableFor	being among the largest steam locomotives ever built ⓘ being among the most powerful steam locomotives ever built ⓘ
numberSeries	4000–4024 ⓘ
operationalUnit	Union Pacific 4014 NERFINISHED ⓘ
operator	Union Pacific Railroad NERFINISHED ⓘ
powerType	steam ⓘ
preservedUnitsLocation	Cheyenne, Wyoming NERFINISHED ⓘ Dallas, Texas NERFINISHED ⓘ Denver, Colorado NERFINISHED ⓘ Green Bay, Wisconsin NERFINISHED ⓘ Omaha, Nebraska NERFINISHED ⓘ Pomona, California NERFINISHED ⓘ Scranton, Pennsylvania NERFINISHED ⓘ St. Louis, Missouri NERFINISHED ⓘ
primaryRoute	Ogden, Utah – Green River, Wyoming NERFINISHED ⓘ Wasatch Range NERFINISHED ⓘ
primaryUse	heavy freight service ⓘ
productionEndYear	1944 ⓘ
productionStartYear	1941 ⓘ
railwayCompany	Union Pacific Railroad NERFINISHED ⓘ
retirementPeriod	1950s ⓘ 1960s ⓘ
survivingUnits	8 ⓘ
totalLocomotiveAndTenderWeight	over 1,200,000 lb ⓘ
totalProduced	25 ⓘ
tractiveEffort	approximately 135,375 lbf ⓘ
typicalOperatingSpeed	35–45 mph ⓘ
usedOn	Overland Route NERFINISHED ⓘ Union Pacific mainline in Wyoming and Utah ⓘ
waterCapacity	approximately 25,000 US gallons ⓘ
weightOnDrivers	about 540,000 lb ⓘ
wheelArrangement	4-8-8-4 ⓘ

Referenced by (2)

Full triples — surface form annotated when it differs from this entity's canonical label.

Baldwin Locomotive Works → notableWork → Union Pacific Big Boy class locomotives ⓘ

Steamtown National Historic Site → hasLocomotive → Union Pacific Big Boy class locomotives ⓘ

this entity surface form: Union Pacific Big Boy No. 4012