Dense fog and snow nearly hide the California Zephyr as it runs through Rocky, Colorado.

Amtrak engine #189 (P42DC) gets a crew change at Rollinsville, Colorado before heading down the Moffat Tunnel Sub to Denver.

In front of a snowy Fort Morgan Power Plant building sits the Great Western saddle tank engine #2176 (0-4-0T). This engine was manufactured in 1930 and worked the Great Western sugar beet factory ... (more)

The California Zephyr 6 train runs eastbound on the Brush Sub through a snowy Hudson, Colorado.

Amtrak engine #189 (P42DC) backs the California Zephyr 6 train into a foggy and snowy downtown Denver, Colorado as it heads to Union Station.

After meeting the eastbound California Zephyr 6 train at a siding in east Roggen, Colorado, the California Zephyr 5 train starts running again westbound on the Brush Sub towards Denver.

In a rare sunrise meet, the California Zephyr 5 train meets the California Zephyr 6 train east of Roggen, Colorado.

RTD light rail train #293 passes an idle BNSF train at the Evan Station in south Denver, Colroado.

Smoke from Canadian wildfires creates an orange glow at sunrise as the California Zephyr runs through Keenesburg, Colorado.

The California Zephyr runs through a crossing at Wiggins, Colorado as the sunrise casts a sepia glow over the tracks.

Amtrak engine #171 (P42DC) leads the California Zephyr through Keenesburg, Colorado as a pink sunrise reflects off the side of the train.

BNSF 4260 (ES44C4) gets ready to take four Stadler FLIRT (Fast Light Intercity and Regional Trains) to DART (Dallas Area Rapid Transit) in Texas. Meanwhile an RTD Light Rail train passes by as it... (more)

A wide shot at the Union Pacific's North Yard in Denver catches two trains that have just entered the yard, while UP 688 (GP 38-2) begins to sort a cut from a train that arrived the day before.

AMTK 41 (P42DC) leads the Southwest Chief towards Levy, New Mexico.

AMTK 135 (P42DC) leads the California Zephyr down the hill into Coal Creek Canyon as it heads to Denver, Colorado.