Light snow is falling as the California Zephyr runs through Rainbow Cut at Plainview, Colorado.

Heavy snow is falling at Plainview, Colorado as the California Zephyr heads towards Tunnel #2 on the Moffat Tunnel Sub.

The California Zephyr whips up the snow as it runs through Tolland, Colorado on its way to the Moffat Tunnel.

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.

A clear day over the Colorado Rockies and a fresh blanket of snow greet the crew of BNSF 6048 (ES44AC) as it passes through Crescent, Colorado on the Moffat Tunnel Sub.

There was a lot of interesting equipment in the San Luis & Rio Grande's yard in Alamosa when I visited. On the left is a former Southern Pacific caboose, Railroad Passenger Car Numbering Bureau (... (more)

BNSF 5696 (AC4400CW) leads a loaded coal train through Hudson, Colorado as it heads to Denver on the Brush Sub.

BNSF 5656 (AC4400CW) leads a loaded coal train through Keenesburg, Colorado as it heads to Denver on the Brush Sub.

BNSF 4461 (Dash9-44CW) leads a freight over the Cache La Poudre River in Fort Collins, Colorado.

BNSF 2549 (GP39-3) runs through Keenesburg on the Brush Sub.

BNSF 2530 (GP39-3) leads a short freight into the siding at Broomfield, Colorado.

KCS 4709 (ES44AC) leads a train of grain towards Spruce, Colorado on the Joint Line.