Amtrak engine #30 (P42DC) leads the California Zephyr through Tolland, Colorado on its way to the Moffat Tunnel.

BNSF Conductor Ryan Lehmuth gets ready to inspect a BNSF coal train which will meet the Denver to Provo train led by SD70ACe #8555 at Tolland, Colorado.

BNSF 8555 (SD70ACe) leads the Denver to Provo train through Tolland, Colorado as it heads to the Moffat Tunnel.

Snow is blowing off the peaks of the Colorado Rocky Mountains as BNSF 5751 (ES44AC) leads a coal train through Tolland, Colorado after just having exited the east portal of the Moffat Tunnel.

UP 8995 (SD70AH) muscles a mega coal train down through Tolland, Colorado on the Moffat Tunnel Sub.

The snow is falling at such a heavy rate that UP 8051 (ES44AC) has to use its pilot to plow the snow off the tracks.

UP 8051 (ES44AC) exits the east portal of the Moffat Tunnel into a heavy snowstorm that is blanketing the valley in nearly two feet of snow.

The snow is so deep that UP 8051 (ES44AC) pushes a wall of snow ahead of the train as it heads to Denver, Colorado on the Moffat Tunnel Sub.

UP 8051 (ES44AC) has emerged from the Moffat Tunnel into a heavy snow storm and will slowly lead an oil can train towards Denver, Colorado.

The pilot of UP 8051 (ES44AC) pushes the heavy snow off the rails as it leads an oil can train through Tolland, Colorado.

Heavy snow is falling at the east portal of the Moffat Tunnel as UP 8051 (ES44AC) splits the signals while running east on the Moffat Tunnel Sub towards Tolland, Colorado.

UP 8016 (ES44AC) leads a train through the snow and fog at Tolland, Colorado as it heads to Denver on the Moffat Tunnel Sub.

UP 9050 SD70AH runs past a frozen Boulder Creek as it heads east through Tolland, Colorado on the Moffat Tunnel Sub.

Heavy snow is falling outside of the Moffat Tunnel East Portal while deep inside a Union Pacific freight train is slowly making its way through the 6.2-mile-long tunnel.

UP 8016 (ES44AC) runs between Tolland and Rollinsville after coming through the Moffat Tunnel and into heavy snow.