BNSF 6829 (ES44C4) snakes through the S curves with a string of gondola cars as it runs south on the Joint Line through Spruce, Colorado.

BNSF 6185 (ES44AC) waits for its turn in the fuel and sand service bay at the BNSF engine servicing facility in Denver, Colorado.

BNSF 1899 SD40-2 waits for service at the BNSF engine servicing facility in downtown Denver.

BNSF 8415 (SD70ACe) is seen from the top of the mountain at Pinecliffe as it leads a coal train down the mountain on the Moffat Tunnel Sub.

BNSF 8475 (SD70ACe) leads a freight through Brighton, Colorado.

BNSF 9045 (SD70ACe) shoves a loaded coal train west towards Denver on the Brush Sub through Brighton, Colorado.

The California Zephyr 6 train heads east on the Brush Sub through Wiggins, Colorado, running past a large pond created from the numerous rainstorms that have pummeled the area.

The Southwest Chief runs south through New Mexico as it heads towards Las Vegas, NM

A veteran SW1200 moves a cut of grain cars in Commerce City, Colorado.

BNSF 8165 (ES44C4) leads an officer's special southbound on the Joint Line at Spruce, Colorado.

BNSF 7911 (ES44DC) gets ready to leave Denver while running south on the Joint Line.

BNSF 1093 (Dash9) leads a formation of Boeing 737 fuselages in a low-level mission.

The California Zephyr runs between tunnels 3 and 4 as it begins the climb up the Moffat Tunnel Sub to the Continental Divide.

UP 688 (GP38-2) pulls a cut of cars out of the Union Pacific's North Yard, which will then get sorted onto various tracks.

BNSF 1093 (Dash9) leads two Boeing 737 fuselages through Littleton, Colorado on the Joint Line.