UP 4533 (SD70M) leads an officer train through Barbara's Gulch between Chemical and Rocky, Colorado.

UP 4533 (SD70M) leads an officer passenger train around the windbreak at Big Ten Curve as it heads into the Colorado Rocky Mountains.

UP 4533 (SD70M) leads an officer special passenger train under Highway 93 and towards Rocky, Colorado.

A Union Pacific officer's special gets the green to enter the east portal of the Moffat Tunnel at Tolland, Colorado.

UP 4533 (SD70M) leads an officer's special towards the Moffat Tunnel, passing the trusty designated chase vehicle dubbed "The F-Unit".

A Union Pacific Officer Special gets ready to leave the North Yard in Denver, Colorado and will run into the Colorado Rockies for the Moffat Tunnel.

A keyhole in the clouds allows a spotlight of sun to shine on a Union Pacific Officer Special as it runs through Coal Creek Canyon, Colorado.

A Union Pacific Officer Special runs towards the evening sun as it gets ready to enter the Moffat Tunnel at Tolland, Colorado.

A Union Pacific Officer Special runs through Rocky, Colorado as it begins the journey into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

UP 4533 shoves the business train into the city winding through the S curve at Ogden Ave.

UP 4533 shove the UP business train off the Rockwell connection as its heads downtown for Ogilvie Transportation Center.

An officer special leaves Portland's Albina Yard after spending the night.

UP 4533 leads an 11 car Inspection train from Salt Lake City to Los Angeles California.

UP 4533 (SD70M) leads an officer's train through Plainview, Colorado.

UP 4533 (SD70M) leads a Union Pacific Officer's Special through the curves at Plainview before entering Tunnel 1 on the Moffat Tunnel Sub.