BNSF 6284 (ES44AC) leads a loaded coal train south on the Joint Line through Spruce, Colorado. .

BNSF 6284 (ES44AC) leads a loaded coal train across a snowy county road in Greenland, Colorado as it heads south on the Joint Line.

Temps are freezing and the Amtrak Winter Park Express kicks up the snow as it runs through Leyden, Colorado at sunrise.

UP 1826 (SD40N) works a cut of cars in the Union Pacific's North Yard in Denver, Colorado.

BNSF 7117 (ES44C4) runs on the BNSF Brush Sub track and gets ready to cross the diamond and the Union Pacific Greeley Sub track as it heads through Commerce City, Colorado on the way to Denver.

BNSF 7647 (ES44DC) leads a manifest train through the snow in Greenland, Colorado on the Joint Line.

BNSF 1958 (SD40-2) runs into the late setting sun in Golden, Colorado.

Rocky Mountaineer's 8600 (SD40M-2) runs towards Big Ten Curve at Rocky, Colorado.

Here is a good profile look of Rocky Mountaineer's GP40-3 that runs on point through the Big Ten Curve in Rocky, Colorado.

CP 7007 leads a grain train on the Brush Sub through Keenesburg, Colorado as it heads to Denver.

Amtrak's Operation Lifesaver #203 (P42DC) leads the California Zephyr towards Roggen, Colorado as a colorful sunrise glows on the Brush Sub.

It's April and snow is falling in Denver as the California Zephyr with Operation Lifesaver #203 (P42DC) on lead runs over the South Platte River in the Denver Yard.

The California Zephyr runs towards Big Ten Curve as it climbs the 2% grade towards the Colorado Rocky Mountains.

RTD commuter train #4036 (Hyndai Eagle P3) runs towards Arvada after leaving Denver on a sunny day.

BNSF 5340 (Dash9) leads an autorack train through the open prairie of Greenland, Colorado as it runs south on the Joint Line.