A fairly fresh-looking BNSF 7986 (ES44C4) shoves a passenger special through Monument, Colorado.

A pair of BNSF heavies run through Monument, Colorado as they head south on the Joint Line.

BNSF 6883 (ES44C4) leads a stack train through Broomfield, Colorado on the Front Range Sub.

The BNSF Coors Beer Train led by BNSF 6202 (ES44AC) passes a waiting UP coal train as it heads towards Golden, Colorado from Denver.

The evening Coors Beer Train led by BNSF 6202 (ES44AC) runs through the signal tower in Denver, Colorado.

UP 5131 (SD70M) leads the Rocky Mountaineer passenger train up the Moffat Tunnel Sub towards Tunnel 1 at Plainview, Colorado.

UP maintenance provide service to some of the 7 engines in the consist as UP 3015 (SD70AH-T4) waits to leads an empty coal train up the Moffat Tunnel Sub.

UP 3015 (SD70AH-T4) leads 7 other motors and a long coal train at Leyden, Colorado as it gets ready to climb the Moffat Tunnel Sub to the Continental Divide.

BNSF 6883 (ES44C4) leads the DenLau train through Broomfield on the Front Range Sub early in the morning.

BNSF 7800 (ES44AC) leads a power-heavy Z train past Barr Lake in Brighton, Colorado.

The California Zephyr with heritage engine AMTK 184 backs into Denver's Union Station. The myriad of catenaries serve RTD's commuter trains, which also share the station.

The California Zephyr leaves Glenwood Springs, Colorado and continues the journey west to California.

The California Zephyr rounds the corner of Blue Mountain and heads into Coal Creek Canyon, Colorado.

The California Zephyr backs into Denver's Union Station, passing between the myriad of catenaries that support RTD's commuter train system.

The California Zephyr is emerging from Tunnel 1 at Plainview, Colorado.