UP 5382 (ES44AC) begins the climb through Big Ten Curve which will help the train achieve a constant 2% grade in elevation.

UP 5382 (ES44AC) leads a power heavy move around Big Ten Curve as it heads into Moffat Tunnel territory.

BNSF 8390 (ES44C4) leads a freight from Arvada towards Rocky, Colorado on the Moffat Tunnel Sub.

Amtrak's Winter Park Express Ski Train is about to conclude another successful year shuttling skiers and snowboarders from Denver to the Winter Park Ski Resort.

After stopping at Denver's Union Station to dropp off and take on passengers, the California Zephyr headed west on the Moffat Tunnel Sub and climbed up the Big Ten Curve.

The Amtrak Winter Park Express Ski Train has had a successful year, shuttling passengers to and from Denver and the Winter Park resort. Every Friday, Saturday and Sunday morning those living on B... (more)

The California Zephyr runs through Big Ten Curve as it climbs up towards the Moffat Tunnel District.

BNSF 8390 (ES44C4) leads the Provo train through 'The Cut' which will take it under Highway 93 at Rocky, Colorado.

Amtrak's Winter Park Express Ski Train, led by heritage engine 130, crests the top of Big Ten Curve as it starts the climb up the foothills on the Moffat Tunnel Sub.

The California Zephyr runs through Rocky, Colorado as it begins the journey into the Rocky Mountains.

The California Zephyr runs through the snow-covered hills of the Big Ten Curve at Rocky, Colorado.

Amtrak's Winter Park Express Ski Train runs through tunnels 3, 4 and 5 on the Moffat Tunnel Sub as it heads into the Colorado Rocky Mountains.

Amtrak's Winter Park Express Ski Train runs through Little Ten Curve and will soon transition through Big Ten Curve as it climbs towards the Moffat Tunnel District on the way to Winter Park.

Here we see a rare sight these days, which is an Amtrak, a BNSF and a Union Pacific train at the same time running through Rocky and Eisele, Colorado. The train in the upper portion of the photo ... (more)

The California Zephyr begins the climb up Big Ten Curve which will help the train gain altitude for the run into the Moffat Tunnel District.