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| width = | height = | axleload = | weightondrivers = | locoweight = | tenderweight = (2/3 load) | locotenderweight = | tendertype = | fueltype = Coal | fuelcap = | watercap = | tendercap = | sandcap = | boiler = | boilerpressure = | feedwaterheater = | firearea = | tubearea = | fluearea = | tubesandflues = | fireboxarea = | totalsurface = | superheatertype = Type A | superheaterarea = | cylindercount = 4 | cylindersize = | frontcylindersize= | rearcylindersize = | hpcylindersize = | lpcylindersize = | valvegear = | valvetype = | valvetravel = | valvelap = | valvelead = | transmission = | maxspeed = | poweroutput = | tractiveeffort = | factorofadhesion = 4.11 | trainheating = | locobrakes = | locobrakeforce = | trainbrakes = | safety = | operator = Union Pacific Railroad | operatorclass = | powerclass = | numinclass = | fleetnumbers = 4014 | officialname = | nicknames = Big Boy | axleloadclass = | locale = | deliverydate = | firstrundate = | lastrundate = July 21, 1959 | retiredate = December 7, 1961 | withdrawndate = | preservedunits = | restoredate = Commenced August 2013 | scrapdate = | currentowner = Union Pacific Railroad | disposition = Undergoing restoration for excursion service, and will be based on Cheyenne, Wyoming, in roundhouse once restoration is completed | notes = Restoration includes conversion from coal to no. 5 oil. }} Union Pacific 4014, or UP 4014, is a four-cylinder articulated 4-8-8-4 Big Boy-type steam locomotive owned by Union Pacific Railroad. 4014 was retired from service on July 21, 1959 and donated to the Railway & Locomotive Historical Society in Pomona on December 1961. The locomotive reached its destination in January 1962 and was displayed in Fairplex until November 2013. Union Pacific 4014 is currently in Union Pacific's Steam Shop in Cheyenne, Wyoming, undergoing extensive restoration work which is intended to return the engine to operational status. When 4014 officially returns to service, it will displace UP 3985 as the largest, heaviest and most powerful operational steam locomotive in the world. == History == UP 4014 was one of 25 4-8-8-4 class locomotives developed by Union Pacific and Alco to overcome issues with the preceding 4-6-6-4 Challenger class locomotives. It was determined that the goals that Union Pacific had set for its new class of locomotive could be achieved by making several changes to the existing Challenger design, including enlarging the firebox to approximately (about ), lengthening the boiler, adding four driving wheels and reducing the size of the driving wheels from .〔〔(【引用サイトリンク】title=The History of the Challengers )〕 The Big Boys are articulated, like the Mallet locomotive design. They were designed for stability at . They were built with a wide margin of reliability and safety, as they normally operated well below that speed in freight service. Peak horsepower was reached at about ; optimal tractive effort, at about . The locomotive without the tender was the longest engine body of any reciprocating steam locomotive in the world. Alco delivered No. 4014 to Union Pacific in December 1941 and it was retired on December 7, 1961.〔〔 4014 traveled for Union Pacific during its 20 years in service.〔 The last revenue train hauled by a Big Boy (No. 4015) ended its run in the evening of July 21, 1959.〔(【引用サイトリンク】title=Big Boy )〕 4014 completed its last run earlier the same day at 1:50 in the morning.〔 Most were stored operational until 1961, and four remained in operational condition at Green River, Wyoming until 1962.〔(【引用サイトリンク】title=4-8-8-4 "Big Boy" Locomotives )〕 Their duties were assumed by diesel locomotives and gas turbine-electric locomotives (GTELs). Of the 25 built, 8 were preserved at various locations around the United States.〔 4014 was donated by Union Pacific to the Southern California chapter of the Railway and Locomotive Historical Society in 1961. It did not reach its destination of Pomona, however, until January 8, 1962.〔(【引用サイトリンク】title=Big Boy #4014 History )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Union Pacific 4014」の詳細全文を読む スポンサード リンク
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