BNSF 7853 (ES44DC) runs south on the Joint Line through Sedalia, Colorado.

UP 8834 (SD70AH) leads an oil train through Coal Creek Canyon after having dropped down from Tunnel #1 on the Moffat Tunnel Sub.

UP 8006 (ES44AC) leads a power heavy train south on the Greeley Sub through Platteville, Colorado.

UP 7425 (ES44AC) runs a hopper train through the North Yard in Denver, Colorado.

UP 8834 (SD70AH) leads an oil can train towards Leyden, Colorado as it heads to Denver on the Moffat Tunnel Sub.

BNSF 1532 (GP28-2) repositions in a busy Denver Yard where it will work side by side other units sorting freight cars.

The California Zephyr through Tolland, Colorado as it heads to the Moffat Tunnel and the Rocky Mountains.

Amtrak engine #163 (P42DC) leads the California Zephyr through the corner at Tolland, Colorado.

Amtrak's Viewliner Inspection Car #10004 gives Amtrak CEO Stephen Gardner and team a great view of Plainview, Colorado and the Boulder Flatirons beyond as the "American View" car runs on... (more)

UP 8006 (ES44AC) leads a power-heavy freight south on the Greeley Sub through Brighton, Colorado. Warm weather has melted the recent snow, providing a reflecting mud puddle alongside the track.

BNSF 6014 (ES44AC) runs south on the Joint Line through Monument, Colorado and towards a patch of recently repaired rail.

The California Zephyr runs past a frozen South Boulder Creek as it heads towards the Moffat Tunnel and Tolland, Colorado.

BNSF 7853 (ES44DC) leads a freight past the rock formations at Palmer Lake, Colorado.

UP 8834 (SD70AH) runs through Coal Creek Canyon as two mid-helper engines in the background run down the hill in the from Tunnel #1.

UP 8834 (SD70AH) leads an oil can train through the turn at Crescent, Colorado on a sunny and windy day.