The last few minutes of sunlight catch UP 3015 (SD70AH-T4) as it waits for a green signal to run through Arvada, Colorado on the Moffat Tunnel Sub.

UP 8085 (AC45CCTE) runs past an Xcel power plant in north Denver as it heads towards the Greeley Sub.

UP 8962 (SD70AH) moves into the North Yard to pick up a train for the Moffat Tunnel Sub.

UP 4014 (4-8-8-4) runs east of Cheyenne, Wyoming and muscles through Archer Hill. It was just announced that instead of the longer run to California this year, the Big Boy will make a run to Denv... (more)

UP 6833 (AC4400CW) holds on the Belt Line before it releases and heads east.

A fresh looking UP 6657 (AC4400CW) waits for a train in the North Yard in Denver, Colorado. Notice the missing number board.

A rare sight catches BNSF 7529 (ES44DC) leading a long officer's special train south on the Joint Line through Castle Rock, Colorado.

BNSF 4322 (Dash9) leads a grain train through the S curve at Castle Rock, Colorado as it runs south on the Joint Line.

Under threatening storm clouds BNSF 5942 (ES44AC) holds a loaded coal train at Hudson, Colorado for an eastbound train that will soon pass.

Snow is falling at Crescent, Colorado as BNSF 8503 (SD70ACe) assists an oil can train down the mountain on the Moffat Tunnel Sub.

BNSF 7125 (ES44C4) leads a motor-heavy oil can train through the area of Cajon Pass in California.

A fairly fresh-looking BNSF 7986 (ES44C4) shoves a passenger special through Monument, Colorado.

A pair of BNSF heavies run through Monument, Colorado as they head south on the Joint Line.

BNSF 6883 (ES44C4) leads a stack train through Broomfield, Colorado on the Front Range Sub.

The BNSF Coors Beer Train led by BNSF 6202 (ES44AC) passes a waiting UP coal train as it heads towards Golden, Colorado from Denver.