AMTK 78 leads the California Zephyr into Tunnel #1 as it heads into Colorado's Rocky Mountains.

AMTK 78 leaves Denver and the Front Range behind and leads the California Zephyr into Coal Creek Canyon, at which point it will start the climb to Tunnel #1 as it heads into Colorado's Rocky Mount... (more)

Looking more like a model train on a layout, UP 1507 (GP40M-2) leads two other units in pulling a pair of hoppers up to Tunnel #1 on the Moffat Line.

AMTK 74 (P42DC) leads the California Zephyr through the tight corners of Coal Creek Canyon.

Amtrak's eastbound "California Zephyr" pops out of Tunnel 1 in Coal Creek Canyon as it descends down the 2-percent grade towards Denver, on September 29, 2018.

The Zephyr skirts the foothills leading to the Colorado Rockies.

The rain clouds part just in time for the sun to catch UP 8564 (SD70ACe) as it is about enter Tunnel 1 after the climb through Coal Creek Canyon.

BNSF 7493 (ES44DC) muscles a load of oil cans up the steep grade to tunnel #1.

BNSF 7073 hits the crossing at Coal Creek Canyon on a hazy day as it heads into the Colorado foothills. The facility you see in the upper right is the National Wind Technology Center at the Natio... (more)

AMTK 10 (P42DC) leads the California Zephyr into the foothills of Coal Creek Canyon and will soon be running through the Colorado Rocky Mountains.

In the late afternoon sunlight, Amtrak's eastbound California Zephyr crawls through the horseshoe curve in Coal Creek Canyon, CO on the UP Moffat Tunnel Subdivision on July 14th, 2018. The train w... (more)

The California Zephyr crosses over Coal Creek Canyon Road as it heads into the Rocky Mountains and towards the Moffat Tunnel

On April 9, 2016, an eastbound Union Pacific loaded oil train pops out of Tunnel 1 into a small pocket of sunshine (literally) on a gorgeous spring afternoon in Coal Creek Canyon.

After meeting the westbound California Zephyr up at Crescent Siding, FXE 4691 emerges out of Tunnel One and starts the descent into Coal Creek Canyon on December 30th, 2017.

The daily Denver to Provo manifest grinds up the east side of the Continental Divide with clear signals all the way to East Portal.