BNSF 5807 (ES44AC) handles an autorack train as it runs south on the Joint Line through Palmer Lake, Colorado.

Snow flurries are falling along the Front Range as BNSF 5146 (Dash9) leads the Provo-to-Denver train down the 2% grade and into Coal Creek Canyon, Colorado.

BNSF 6114 (ES44AC) shoves a coal train through Barr Lake at Sunrise on the Brush Sub.

You can still find an Executive MAC working The Switch in Longmont, Colorado.

BNSF 1984 (SD40-2) leaves the yard and passes over the South Platte River in downtown Denver, Colorado.

Amtrak's California Zephyr runs over what appears to be a roller coaster track at sunrise as it heads towards Roggen, Colorado on the Brush Sub.

Amtrak's sharp-looking Operation Lifesaver #203 leads the California Zephyr down from Tunnel #1 and into Coal Creek Canyon, Colorado

BNSF 6109 (ES44AC) leans into the elevated curve at Keenesburg, Colorado as it heads east on the Brush Sub.

BNSF 1579 (SD40-2) peaks out of the shadows as it waits for servicing at the engine facility in downtown Denver, Colorado.

BNSF 5146 (Dash9) emerges from the east portal of the Moffat Tunnel and into snow as it heads through Tolland, Colorado.

BNSF 7073 (ES44AC) muscles the Provo-to-Denver train towards Arvada, Colorado on the Moffat Tunnel Sub.

The Colorado Rocky Mountains are covered in snow as BNSF 6109 (ES44AC) leads a freight through an elevated curve at Keenesburg, Colorado.

The California Zephyr runs through Keenesburg, Colorado as an orange-colored sunrise paints the horizon.

Norfolk Southern's Savana and Atlanta heritage #1065 (SD70ACe) visits the BNSF engine facility in Denver, Colorado.

Heavy snow falls on UP 7789 (C45ACCTE) as it leads a freight west on the Moffat Tunnel Sub through Tolland, Colorado.