UP 7395 AC45CCTE leads a stack train through the rock formations at Cajon Pass, California

BNSF 2698 (GP39-3) runs through Keenesburg, Colorado as it heads towards Hudson to pick up a load of oil cans.

UP 7447 (AC45CCTE) leads a freight through the signal on track 2 at Cajon Pass in California.

UP 9013 (SD70ACe) leaves the Denver, Colorado skyline behind and runs past the refineries in Commerce City on the Greeley Sub.

UP 9013 (SD70ACe) leads a freight past a power plant in northeast Denver.

BNSF 2698 (GP39-3) and mate run light through Keenesburg, Colorado after dropping off a load of hoppers at Roggen.

A colorful pair of light power wait for an assignment in the Denver Yard.

BNSF 7997 (ES44C4) shoves a stack train through the S curves near the Tehachapi Loop.

BNSF 7783 (ES44DC) leads one of the many container trains that run daily through the Cajon Pass in California.

BNSF 5017 (Dash9) leads a train down the grade at Cajon Pass in California.

Old meets New. Morning storm clouds oversee the California Zephyr meeting a BNSF officer's train in Keensburg, Colorado, passing the 1952 business car 'Gerald Grinstein'.

Union Pacific 8981 (SD70AH) leads a freight over a bridge in Cable, Colorado.

Here we see a wide-angle view of the Tehachapi Loop as a Union Pacific SD70AH leads a freight through the 360-degree curve which helps train drop down in grade.

The California Zephyr 5 catches the tail end of a beautiful sunrise as it runs through east Keenesburg on the Brush Sub.

UP 6611 (AC4400CW) muscles a sand train under a bridge at Cajon Pass in California.