UP 7788 (C45ACCTE) leads a freight past the signal at Leyden, Colorado as it heads to Denver on the Moffat Tunnel Sub.

Heavy snow is falling as the California Zephyr whips the snow off the tracks while running west on the Moffat Tunnel Sub.

BNSF 5710 (AC4400CW) runs towards Leyden, Colorado on the Moffat Tunnel Sub.

Heavy snow is falling as the California Zephyr runs west on the Moffat Tunnel Sub through Leyden, Colorado.

A power-heavy UP freight heads towards Leyden, Colorado after coming down the mountain on the Moffat Tunnel Sub.

UP 7833 (ES44AC) runs the Grand Junction train through Leyden, Colorado towards Denver on the Moffat Tunnel Sub.

The California Zephyr runs past the signals at Leyden, Colorado as it heads to Denver's Union Station.

Amtrak engine #18 (P42DC) leads the California Zephyr 6 train through Leyden, Colorado as it heads to Denver on the Moffat Tunnel Sub.

BNSF empty oil train from NS Interchange in Chicago, IL to the oil fields Wellington, UT (U-NSDWGN0-01T) charges up the mountain grade of UP's Moffat Tunnel Sub near Leyden, CO as Denver's skyline... (more)

The California Zephyr 5 train out of Denver sports a Heritage Phase VII unit in second position as it runs through Leyden, Colorado.

Amtrak engine #76 (P42DC) runs through Leyden, Colorado.

UP 6825 (ES44AC) runs past the signal at Leyden, Colorado.

UP 8009 (ES44AC) muscles an oil can through Leyden, Colorado.

UP 2698 (AC4400CW) leads an oil can train through Leyden, Colorado.

UP 5624 (AC4400CW-CTE) runs a freight south through Leyden on the Moffat Tunnel Sub.