UP 8093 (AC45CCTE) leads a freight over fresh snow on the Moffat Tunnel Sub as it heads towards Denver, Colorado.
BNSF 6113 (ES44AC) leads a loaded coal train south on the Joint Line between Castle Rock and Larkspur, Colorado.
BNSF 7147 (ES44C4) leads a windmill blade train through Larkspur, Colorado.
The California Zephyr passes through fog at Keenesburg at dawn.
A pair of executive SD70MAC's pull a load out of the BNSF yard in Cheyenne and head for Fort Collins, Colorado.
Executive Grinstein MAC BNSF 9658 runs over a bridge at Owl Canyon in Wellington, Colorado.
A rare wagon wheel Executive Grinstein MAC (BNSF 9658) runs towards Fort Collins from Cheyenne, Wyoming.
After the crew change at the Cheyenne Depot, UP 7655 (ES44AC) exits the yard and heads west.
Super dense fog and light sleet greet UP 7952 (ES44AC) as it runs through S curves east of Cheyenne, Wyoming.
A veteran UPY 691 (GP15-1) waits for a mate to pair up and then will sort cars in the Union Pacific's North Yard in Denver, Colorado.
A number of Union Pacific SD40N (former SD40-2's) are currently working in the North Yard sorting freight cars throughout the day.
BNSF 7147 (ES44C4) leads a windmill blade train through the Black Forest in Larkspur, Colorado.
Helper engine BNSF 9216 (SD70ACe) waits on a siding at Union, Colorado to assist any train that might need help getting over the Palmer Divide.
BNSF 6100 (ES44AC) leans into the elevated curve at Keenesburg, Colorado.
After running through Little Ten Curve the California Zephyr rounds the base of Big Ten Curve which will elevate the train to the track seen in the background.