Up, up and away. BNSF 7073 (ES44DC) leads a freight on the steep climb up to Tunnel #1 as it begins the journey through the Colorado Rocky Mountains. You can really appreciate the amount of grad... (more)

With the city of Denver far in the background, a Union Pacific freight swings through ā€œLittle 10 Curveā€ at Rocky, Colorado, on the afternoon of June 20, 2018.

She'll be coming around the mountain when she comes.

Amtrak 837 (P42DC) has just come through tunnel #1 in the upper left and continues leading the California Zephyr down-grade towards Arvada, Colorado.

The California Zephyr runs through some of the most scenic landscape in the country, from the Great Plains to the Colorado Rocky Mountains and then the coast of California.

A triple header California Zephyr begins the climb to the foothills through Big Ten Curve and will rise nearly 4,000 vertical feet from Denver to Winter Park and the Colorado Rocky Mountains.

The California Zephyr heads to tunnel #1 and the Colorado Rocky Mountains on its way to the west coast.

AMTK 10 is leading the California Zephyr through one of the 28 tunnels it will enter before finally going through the long Moffat Tunnel, which will put the Zephyr on the west side of the Continen... (more)

AMTK 10 leads a triple header California Zephyr up the grade to Tunnel #1. It will pass through 29 tunnels before stopping in Winter Park, Colorado.

The evening California Zephyr drops out of the foothills and rounds Big Ten Curve. It will run through residential sections of Arvada on its way to Denver's Union Station.

On the longest day of the year in 2018 in the northern hemisphere, Amtrakā€™s eastbound California Zephyr rounds Big 10 Curve just west of Rocky on Union Pacificā€™s former Rio Grande main line th... (more)

Three pulling and two pushing. BNSF 9054 (SD70ACe) leads an oil can train through Big Ten Curve as it drops in grade following its journey through the Colorado Rockies.

Amtrak 207 leads the California Zephyr through tunnel #1 as it descends towards Rocky, Colorado and the Big Ten Curve.

Amtrak 207 leads the California Zephyr through the Big Ten Curve as it leaves the Rocky Mountains and heads to Denver.

UP 6313 (AC440CW) pulls a coal train up the steep grade to tunnel number 1.