BNSF 8476 (SD70ACe) muscles an empty coal train out of Denver on the Brush Sub.

A fresh layer of snow has blanketed the foothills and trees as Amtrak 130 leads the California Zephyr up the Moffat Tunnel line and into the Colorado Rocky Mountains.

BNSF 1656 (SD40-2) brings a small freight into Denver on the Brush Sub.

UP Western Pacific special 1983 (SD70ACe) paid a visit to Denver, spotted here sitting in the Union Pacific's North Yard.

BNSF 7931 leads a container train towards Palmer Lake, Colorado.

An early morning freezing fog has coated the trees in ice, making for a colonnade of frozen trees along Atwood Street in Longmont, Colorado.

BNSF 1680 (SD40-2) works the Denver Yard sorting freight cars.

Here is an over/under shot as a BNSF freight heads into Cheyenne over the old C&S bridge while UP 8632 leads a freight out of the west end of the UP yard.

The Denver Rock Island Railroad's SW8 can currently be found working the Stockyards area in central Denver. They will alternate using their SW1500, which carries the blue paint scheme.

BNSF 2313 (GP38-2) leads a small freight out of Longmont towards Boulder, Colorado.

UP 5841 (AC44CWCTE) leads a freight through the signal tower on the west side of the large UP yard in Cheyenne, Wyoming.

UP 1853 (SD40-2) pulls a string of freight for sorting in the large UP yard in Cheyenne, Wyoming.

UP 7997 (ES44AC) leads an inbound sand train as another train exits the yard through the signal bridge on the east end of the massive complex. Sharp-eyed foamers will notice four 3GS21B units fol... (more)

Here is an over/under shot with a bonus. UP Northwestern Special 1995 was tail-end-Charlie on a container train heading west out of the Cheyenne yard. Check out the roached unit ahead of 1995...... (more)

UP 8448 (SD70ACe) brings a container train into the Cheyenne yard. It is amazing how many trains will pass through the yard in an hour.