BNSF 6295 (ES44AC) leads the Provo to Denver train out of the east portal of the Moffat Tunnel and into light snow falling over Tolland, Colorado.

UP 9581 runs into light snow showers as it exits the east portal of the Moffat Tunnel with an oil can train.

As a passenger watches out the rear window, the California Zephyr 5 train gets ready to enter the east portal of the Moffat Tunnel.

Snow clouds greet the California Zephyr 6 train as it escorts two Charger units through Tolland, Colorado on the Moffat Tunnel Sub.

BNSF 9295 (SD70ACe) leads a freight through Tolland, Colorado on the Moffat Tunnel Sub.

BNSF 8567 (SD70ACe) shoves a freight towards the Moffat Tunnel in Tolland, Colorado.

Snow blowing through the trees with a setting sun creates snow rays as the Amtrak Winter Park Express Ski Train exits the east portal of the Moffat Tunnel.

BNSF 8555 (SD70ACe) leads a freight towards the Moffat Tunnel at Tolland, Colorado.

Light snow falls as the Amtrak Winter Park Express Ski Train heads to the Moffat Tunnel in Tolland, Colorado.

Amtrak engine #163 (P42DC) leads the California Zephyr through Tolland, Colorado on its way to the Moffat Tunnel.

The California Zephyr through Tolland, Colorado as it heads to the Moffat Tunnel and the Rocky Mountains.

Amtrak engine #163 (P42DC) leads the California Zephyr through the corner at Tolland, Colorado.

The California Zephyr runs past a frozen South Boulder Creek as it heads towards the Moffat Tunnel and Tolland, Colorado.

BNSF 9295 (SD70ACe) leads a freight through Tolland, Colorado as it heads towards the Moffat Tunnel.

The BNSF Denver to Provo train makes smoke as the lead ACe muscles the heavy train forward towards the Moffat Tunnel.