The California Zephyr 5 train runs out of Tunnel #1 and towards Plainview, Colorado on the Moffat Tunnel Sub.

The California Zephyr reflects off Barr Lake as it runs to Denver on the Brush Sub.

BNSF 7678 (ES44DC) leads a freight through Keenesburg, Colorado as it heads to Denver on the Brush Sub.

BNSF 5700 (ES44AC) leads a freight around the corner at Crescent, Colorado.

BNSF 5873 (ES44AC) leads auto racks past the refineries at Commerce City, Colorado.

The California Zephyr exits Tunnel #1 at Plainview, Colorado.

Amtrak engine #170 (P42DC) heads into Tunnel 13 as runs eastward on the Moffat Tunnel Sub.

CP 9836 (AC4400CW) and Belle companion leads a grain train on the Joint Line through Castle Rock, Colorado.

CP 9836 (AC4400CW) leads a grain train over the Santa Fe Bridge in Larkspur, Colorado.

BNSF 2371 (GP38-2) waits for orders with other BNSF power as they sit in the yard in Golden, Colorado.

Amtrak engine #72 (P42DC) exits Tunnel #1 at Plainview, Colorado as it leads the California Zephyr into the Colorado Rocky Mountains on the Moffat Tunnel Sub.

Amtrak engine #72 (P42DC) leads the California Zephyr through Wiggins, Colorado at sunrise.

UP 5567 (AC4400CW-CTE) muscles a coal train uphill at Rocky, Colorado as it heads to Denver.

UPY 625 (GP15-) works the north yard solo as it shoves a cut of cars in the large yard in Denver, Colorado.

Canadian Pacific #9836 (AC4400CW) runs through the open lands of Greenland, Colorado, crossing over the county road as it heads southbound on the Joint Line.