Light snow falls on UP 6562 (ES44AC) as it waits for servicing in the North Yard in Denver, Colorado.

UP 7459 (ES44AC) anchors a string of heavies as they wait for service in the Union Pacific's North Yard in Denver, Colorado.

Denver Rock Island Railroad's SW1500 shoves a load of cars into the yard which is across the street from a Colorado National Guard armory.

Denver, like many cities, have a homeless population that take daily risks to access many encampments alongside active tracks.

BNSF 9803 (Grinstein SD70MAC) sits in the yard of the BNSF engine servicing center in Denver, Colorado.

BNSF 9015 (SD70ACe) leads a freight out of the yard in Denver, Colorado.

BNSF Executive Grinstein #9709 leads the Coors Beer Train as it runs to the Denver Yard.

BNSF Executive Grinstein #9709 leads the Coors Beer Train back into Denver from Golden, Colorado.

UP 801 (GP38-2) works the ladders in the North Yard in Denver, Colorado.

UP 1507 (GP40M) moves through the Union Pacific's North Yard in Denver, Colorado.

Its Throwback Thursday at the BNSF Engine Servicing Center in Denver, Colorado as two Executive Grinstein MACs and a Cascade Green Burlington Northern unit wait for servicing.

BNSF 9015 (SD70ACe) brings a freight into the Denver Yard and will back the cars into a ladder in the massive facility.

BNSF 1720 (SD40-2) pulls a cut of cars out of the Denver Yard for sorting.

It's great to see an old school Burlington Northern SD40-2 still in Cascade Green paint. This one was at the BNSF engine servicing facility in Denver, Colorado.

The California Zephyr passes some BNSF motors as it winds through the Denver Yard. It will soon back into Denver Union Station to pick up a new crew and passengers for the run toward the Moffat T... (more)