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RailPictures.Net Photo: UP 3985 Union Pacific Steam 4-6-6-4 at Archer, Wyoming by Collection of Chris Zygmunt

Net Photo: UP 3985 Union Pacific Steam at Archer, Wyoming by Collection of Chris Zygmunt

RailPictures.Net Photo: UP 3991 Union Pacific Steam 4-6-6-4 at Cheyenne, Wyoming by Collection of Chris Zygmunt

UP 3991 Union Pacific Steam at Cheyenne, Wyoming -- A double header consisting of a Challenger and a Big Boy, make a run for the hill. The first car has a wing load for an aircraft.

Union Pacific 4-12-2 9514, Class UP-5, was built by ALCO in 1930, one of eighty-eight locomotives. As built, she was numbered 9077, later re-numbered to 9514. These three-cylinder locomotives had the third cylinder located in the center of the steam chest. The third cylinder drove an eccentric in the axle of the second pair of drivers. The UP 9000s had two outside 27"x32" cylinders driving the third set of drive wheels and a third 27"x31" cylinder in the center driving the second axle.

Net Photo: 9514 Union Pacific at Hammett, Idaho by Juice Junkie

RailPictures.Net Photo: UP 3987 Union Pacific Steam 4-6-6-4 at Cheyenne, Wyoming by Collection of Chris Zygmunt

Net Photo: UP 3987 Union Pacific Steam at Cheyenne, Wyoming by Collection of Chris Zygmunt

Union Pacific. Steam 4-6-6-4  King Hill, Idaho, USA  September 26, 2005 Locomotive No.  UP 3985

Union Pacific. Steam 4-6-6-4 King Hill, Idaho, USA September 26, 2005 Locomotive No. UP 3985

RailPictures.Net Photo: UP 3985 Union Pacific Steam 4-6-6-4 at Lynch, Wyoming by Doug Lilly

Net Photo: UP 3985 Union Pacific Steam at Lynch, Wyoming by Doug Lilly

This is the most powerful steam locomotive ever made, the Challenger! Still in operation as as Union Pacific train, it travels as a promotional gimmick thrilling viewers wherever it goes! Steam power, baby!

This powerful articulated steam locomotive, one of the Challenger class with a wheel arrangement, was restored to operation several decades after it was retired by the Union Pacific railroad.

RailPictures.Net Photo: UP 4003 Union Pacific Steam 4-8-8-4 at Cheyenne, Wyoming by Collection of Chris Zygmunt

Net Photo: UP 4003 Union Pacific Steam at Cheyenne, Wyoming by Collection of Chris Zygmunt

Union Pacific 4-8-8-4 "Big Boy" Locomotive 4017 and a westbound mixed manifest round a curve on the approach to Green River, WY. Photo by R. H. Kindig, 1957.

Union Pacific Big Boy 4017 and a westbound mixed manifest round a curve on the approach to Green River, WY. Photo by R.

Big Boy 4011 has cut off its train from Cheyenne and soon will head for the Laramie roundhouse, where workers will ready it for another trip over Sherman Hill. In 1957, UP steam has two more seasons in front of it.

Big Boy 4011 has cut off its train from Cheyenne and soon will head for the Laramie roundhouse, where workers will ready it for another trip over Sherman Hill.

No. 3935 at Weber Canyon, Aug.1946

1946 Aug - Weber Canyon - Don Strack

No. 3935 at Weber Canyon, Aug.1946

Train in the snow # 3604.   What a beautiful ride.    22539759_2138666892826314_7896199449964674220_n.jpg (847×960)

Denver & Rio Grande Western, class, was built by Brooks in 1927 and scrapped in 1947

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