Storm clouds are brewing as BNSF 7985 (ES44C4) leads a 10 engine consist and a long freight as it climbs the grade towards Sedalia, Colorado.

BNSF ACe 9295 climbs the grade between Castle Rock and Larkspur on the southbound track of the Joint Line.

Recently refurbished light power wait in the Union Pacific's North Yard in Denver. UP 700 was built in 1980 as a GP38-2 for the Missouri Pacific Railroad.

A ghostly BNSF 5152 (Dash9) runs a freight through heavy fog and light snow as it passes Plainview, Colorado.

BNSF 6246 (ES44AC) is on a siding in Union, Colorado, waiting to help any train that needs an assist over the Palmer Divide between Greenland and Monument.

BNSF 9295 (SD70ACe) pulls a mixed freight towards Palmer Lake on the Joint Line

BNSF 9295 (SD70ACe) pulls a mixed freight through the S curve in Castle Rock, Colorado.

BNSF ACe 9254 runs between the shadows of the Black Forest in Larkspur, Colorado.

BNSF 6108 (ES44AC) runs along a ridge through Larkspur, Colorado.

Judging by heat signature given off, BNSF 9272 (SD70ACe) is working hard to pull a loaded coal train through Greenland, Colorado.

BNSF 9254 (SD70ACe) runs an empty coal on the northbound track of the Joint Line between Larkspur and Castle Rock.

With only minutes of sun left, BNSF 9254 (SD70ACe) glows as it leads an empty coal towards Sedalia, Colorado.

UP 7001 (AC4400CW) leads a 3x2 motor consist pulling a heavy coal train over the Santa Fe Bridge in Larkspur, Colorado.

UP 6692 (AC4400CW) runs the ridge through the Black Forest in Larkspur, Colorado.

UP 6692 (AC4400CW) shoves a loaded coal train over the Santa Fe Bridge in Larkspur, Colorado