Shrouded in steam, the Big Boy is putting on a show in the brisk cold morning air as they get ready to take the turn at Marshall.

Big Boy UP 4014 runs through the snow over a bridge north of LaSalle, Colorado.

UP big boy 4014 sits on display in Duluth.

The long and graceful look of Big Boy UP 4014 belies the massive size when viewed up close. Here the mechanical marvel runs at top speed through Byers, Colorado.

A very cold morning greets a member of the Union Pacific 4014 steam crew as he cleans the engineers front window in preparation for the departure north to Little Rock.

Two of Alco's finest, eastbound on the 1.14% Wasatch Grade at Castle Rock.

After traveling across western Kansas and eastern Colorado, UP 4014 pulls into Denver's North Yard on a cold and dreary afternoon and will sit for a night before going home. Little did the crew ... (more)

UP 4014 BigBoy is on the outskirts of Cheyenne, Wyoming, with the crew no doubt happy at the prospects of spending time at home after such a long cross-country journey.

The day is breaking as the Union Pacific Steam Crew work to ready UP 4014 for it's trip back down Cajon Pass. This will be the second time that a Big Boy was operated, under steam, 'west' through ... (more)

UP 4014 rests in Yermo yard under the stars.

At Sinclair, Wyoming, on May 4, 2019, Union Pacific Big Boy No. 4014 leads “The Great Race to Ogden” passenger special heading to the celebration of the 150th anniversary of the completion of ... (more)

Union Pacific Big Boy No. 4014 is spending its last day on the road of a two month southwest road trip passing through Denver in the middle of blizzard that deposited over a foot of snow blanketin... (more)

The size of Union Pacific’s Big Boy 4014 is evident as it passes by in the middle of snowstorm in the Denver area on November 26, 2019. With a two month tour of the southwest wrapping up and aft... (more)

UP 4014 storms up the 1% grade eastbound out of Sharon Springs, Kansas. The Limon Subdivion is a roller-coaster of 1% grades for 210 miles. The grade profile and crisp clear weather made for an i... (more)

The snow was falling so fast in Denver and the steam cloud from the freezing temps was so dense that a yard vehicle helped guide the Big Boy out of the UP's North Yard in Denver.