UP 8243 (ES44AC) gets ready to leads a freight into Tunnel #1 at Plainview, Colorado.

UP 8243 (ES44AC) leads a power heavy freight up the grade at Coal Creek Canyon, Colorado towards Tunnel 1.

UP 8243 (ES44AC) leads a group of heavies west out of the Union Pacific's North Yard, where they will travel on the Moffat Tunnel Sub into the foothills and then the Colorado Rocky Mountains.

UP 8243 (ES44AC) rounds the curve at the base of Blue Mountain and will soon start the climb out of Coal Creek Canyon up to Tunnel #1.

UP 8243 (ES44AC) leads a freight into the cut just east of Rocky, Colorado.

UP 8243 (ES44AC) leads a power-laden freight through Coal Creek Canyon, Colorado after a heavy snow.

UP 8243 (ES44AC) has climbed the 2% grade up to Tunnel 1 at Plainview while the rest of the train follows down in Coal Creek Canyon.

UP 8243 (ES44AC) rounds the corner leading to Tunnel 19 just west of Crescent, Colorado.

UP 8243 (ES44AC) leads a power loaded freight through the Union Pacific's North Yard as it gets ready to take the Moffat Tunnel Sub into the Colorado Rocky Mountains.

UP 8243 (ES44AC) leads a freight through the cut that runs under highway 93 and leads to the Rocky Siding.

UP 8243 (ES44AC) leads 5 other mates and a long freight through Coal Creek Canyon and will soon climb the grade to Tunnel 1 seen in the upper left.

A Union Pacific "UPS, Expedited Intermodal" train (UP ZCIG2 28) climbs upgrade in San Timoteo Canyon after originating in the railroad’s Industry Yard (in the City of Industry) 52-mile... (more)

The Union Pacific rail operations do not cease at the start of the night shift at West Colton.

DPU 8243 pushes westbound UP freight through James Ca.