The California Zephyr 6 train drops down the 2% grade into Coal Creek Canyon, Colorado as it heads to Denver on the Moffat Tunnel Sub. Denver's skyline is visible in the upper part of the photo. ... (more)

Storm clouds build overhead as the California Zephyr climbs out of Coal Creek Canyon towards Tunnel #1.

RMRX 8020 (GP40-3) leads the Rocky Mountaineer passenger train out of Coal Creek Canyon and towards Tunnel #1.

The Rocky Mountaineer runs through Coal Creek Canyon, Colorado as it heads into the Colorado Rocky Mountains on the way to Utah.

RMRX 8020 (GP40-3) leads the Rocky Mountaineer over Highway 72 in Coal Creek Canyon, Colorado.

Rocky Moutaineer's GP40-3 leads the way around the rock formations above Coal Creek Canyon.

Coal Creek Canyon is starting to green up with the spring rains as the Rocky Moutaineer heads into the Colorado Rocky Mountains on their way to Utah.

BNSF 6341 (ES44AC) crosses Highway 72 in Coal Creek Canyon as it heads to Denver on the Moffat Tunnel Sub.

The Rocky Mountaineer passenger train climbs out of Coal Creek Canyon on its way into the Colorado Rockies.

The Rocky Mountaineer's GP40-3 (#8021) leads the passenger train through Coal Creek Canyon on the Moffat Tunnel Sub.

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.

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

A heavy spring snowstorm pounds the Colorado Front Range as BNSF 6341 (ES44AC) leads the Provo train down the 2% grade into Coal Creek Canyon on the Moffat Tunnel Sub.

BNSF 9210 (SD70ACe) leads an oil can train down the 2% grade into Coal Creek Canyon as it heads to Denver on the Moffat Tunnel Sub.

UP 8359 (SD70ACe) climbs the 2% grade out of Coal Creek Canyon towards Tunnel #1 at Plainview, Colorado.