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.

New to the database is UP 1730, an ex-Missouri Pacific GP15AC built in 1982.

UP 1826 (SD40N) moves a cut of hoppers for sorting in the Union Pacific's North Yard in Denver, Colorado.

The California Zephyr rounds Blue Mountain as it gets ready to enter Coal Creek Canyon on it journey into the Moffat Tunnel District.

UP 7900 (ES44AC) leads a coal train into the Union Pacific's 36th Street Yard in Denver, Colorado.

UP 1826 (SD40N) passes three BNSF motors that are sitting in the Union Pacific's North Yard in Denver, Colorado.

BNSF 7147 (ES44C4) passes under the RTD Commuter Rail line that runs out to Thornton, Colorado.

BNSF 1899 (SD40-2) leads a freight towards Denver, Colorado on the Brush Sub.

Light power dominates the Union Pacific North Yard in Denver, Colorado.

Its' Throwback Thursday at the BNSF engine servicing facility as 1656 (SD40-2) waits for service or assignment.

BNSF 7828 (ES44DC) runs south on the Joint Line, leaving Castle Rock and heading towards Larkspur, Colorado.

The California Zephyr runs through Coal Creek Canyon as it heads up the Moffat Tunnel Sub.