A BNSF stack train runs south on the Joint Line through Palmer Lake, Colorado.

Snow overnight fell on DRGW 3011 (GP30) and Rio Grande caboose in the yard of the Colorado Railroad Museum in Golden, Colorado.

BNSF 7735 (ES44DC) whips up the snow as it catches a ride with four other BNSF units on the Brush Sub.

Snow is falling as a pair of BNSF Geep 39-3's leads three heavies in a light move to Denver through Tonville, Colorado on the Brush Sub.

Snow and fog greet the California Zephyr as it runs through Plainview, Colorado.

Snow and frosty fog greet the California Zephyr as it runs through Plainview, Colorado on the Moffat Tunnel Sub.

The California Zephyr kicks up the snow as it runs through Leyden, Colorado on its way to the Colorado Rocky Mountains.

The California Zephyr runs through Tunnel 3 at Plainview on the Moffat Tunnel Sub.

UP 712 (GP38-2) waits for a run to the sand and fuel island in the North Yard in Denver, Colorado.

BNSF 6928 leads a JB Hunt stack train through Colorado Springs, Colorado on the Joint Line.

A trio of BNSF engines pay a visit to the Union Pacific's North Yard in Denver, Colorado.

A trio of BNSF engines sit in the Union Pacific's North Yard in Denver, Colorado.

The Rocky Mountaineer Railtours engines sit in the Union Pacific's 36th Street Yard in Denver, Colorado, waiting for light maintenance.

BNSF ACe 8538 shoves an empty coal train through the girder bridge in Nixon, Colorado.

BNSF 6928 (ES44C4) runs south on the Joint Line towards Colorado Springs, Colorado.