Yellow heritage: Walking along the fuel tracks at Union Pacific’s North Yard in Denver, Colorado, an electrician carries his ID tag and tools of the trade to another locomotive on April 15, 2013. ... (more)

Snowy pit stop: Union Pacific locomotives get serviced at North Yard in Denver, Colorado, on April 15, 2013. No matter what the weather, railroading continues on; even in a heavy snow, railroaders... (more)

UPY 681 huddles with the other North Yard workers against the sub-freezing temperatures until they receive their orders.

At 7:43 p.m. on April 15, 2013, dusk settles in on the fuel track at Union Pacific’s North Yard in Denver, Colorado. Snow is still coming down hard on this tax day blizzard, and the Denver area go... (more)

Takin’ down the blue flag: After finishing up his work, an employee of Union Pacific’s fuel track at North Yard in Denver, Colorado, removes the blue flag from AC440CW-CTE No. 5652 as heavy snow c... (more)

In a snowstorm that hit the Denver area on Tax Day 2013, locomotives await servicing at Union Pacific’s North Yard. Some parts of the area received over a foot of wet snow by the time the storm de... (more)

A going away shot of Talgo's strange looking new equipment as it heads North into Denver. This was a deadhead move that originated at the test track at Pueblo and was heading to Oregon where this ... (more)

A string of 9 UP engines get positioned in the UP North Yard. In the group are 5659 (AC4400CWCTE), 4489 (SD70M) and a slew of AC440CW’s, including 7096, 6814, 6572, 6161 and 6435.

Although the symbol of luxury rail travel in their day, these two cars look small compared to today’s gleaming behemoths that Amtrak uses. The bigger dome car named Grand Dome is SP 3604 and was ... (more)

Remote control equipped engines wait in UP's 36th Street Yard for the call to action.

A colorful selection of light power gathers at the BNSF engine shop in Denver, including BNSF 1961 (SD40-2), 1601 (SD40-2), 1572 (SD40-2R), 1600 (SD40-2), 2770 in yellow and blue (GP39-2), 2700 (G... (more)

Two vintage BNSF units work the Denver Yard by pulling a string of frieght over the South Platte River and then backing into the yard, sorting the various freight cars as they go.

Snow clouds are moving in on BNSF 1084 (Dash 944CW)and team as they head to the Denver Yard to pick of a freight and get out of town before the snow flies.

Driver 8 rarely takes a break during Wyoming’s Cheyenne Frontier Days. UP 844 gives off steam and a loud whistle and heads off into an early morning sunrise, taking passengers from Denver to Chey... (more)

Three former Rio Grande GP60s, with No. 5702 in fresh Union Pacific paint, sit at Denver Union Station as back up power for the next day’s annual Cheyenne Frontier Days train seen a few tracks ove... (more)