UP 2010 (ES44AC) runs through Little Ten Curve and will soon leave the Rocky siding area on its way to Denver, Colorado.

UP 2010 (ES44AC) runs past the signals at Rocky on its way to Denver, Colorado. It will soon meet the California Zephyr at Leyden for continuing on.

UP 2010 (ES44AC) runs through Big Ten Curve and will soon drop down the hill further into Little Ten Curve as it heads to Denver, Colorado.

The California Zephyr has left Denver, Colorado and enters the cut east of Rocky as it heads towards the Rocky Mountains.

UP 6675 (AC4400CW) has just transitioned through Big and Little Ten Curves and is now leaving Rocky, Colorado as it heads to Denver.

The California Zephyr 5 train runs through the cut leading to Rocky, Colorado as it heads towards the Moffat Tunnel district.

The California Zephyr 5 train rounds the corner at the base of Big Ten Curve and will begin the climb up the Moffat Tunnel Sub towards the Continental Divide.

The California Zephyr climbs through Big Ten Curve at Rocky, Colorado as it begins the journey up the Moffat Tunnel Sub.

UP 8330 (SD70ACe) leads a coal through Rocky, Colorado.

An eastbound Union Pacific coal load led by GE AC4400CW No. 7086 is in the siding at Rocky, Colorado, while above, UP’s West local traverses Rocky Spur on January 27, 1998. Power for the local i... (more)

An eastbound Union Pacific coal train drops off the mesa that contains Big 10 Curve and is about to pass over the west switch of Rocky siding on Colorado’s Moffat Tunnel line on April 28, 2002. ... (more)

The California Zephyr passes a waiting Union Pacific coal train at Rocky, Colorado.

The westbound Rocky Mountaineer tour train works toward Big 10 Curve west of Rocky, Colorado, on October 12, 2022. The eleven-car train will soon be on the upper level of track at the east switch ... (more)

UP 8330 (SD70ACe) gets ready to leave the siding at Rocky, Colorado with a loaded coal train after the California Zephyr passed and is heading towards Big Ten Curve on the Moffat Tunnel Sub. ... (more)

A trio of Rio Grande EMD GP40-2 take Union Pacific’s West local eastbound out of Rocky, Colorado, back to Denver on the Moffat Tunnel Subdivision on October 18, 2001.