Union Pacific UPY 577 has maintenance work done on Track 2 in the Diesel House at the railroad’s former Rio Grande Burnham Shops in Denver, Colorado, on December 8, 2015.
The snow is falling fast as UP 4404 (SD70M) waits for passengers to load up an officer's Special passenger train, which will run up the Moffat Tunnel Sub and through the Continental Divide.
Falling snow covers both the California Zephyr as it leaves the North Yard and the Union Pacific Officer Special passenger train that will soon follow the Zephyr up the Moffat Tunnel Sub.