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.

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

Amtrak’s westbound California Zephyr climbs the two percent grade up the Front Range of the Rocky Mountains west of Denver, Colorado, on October 12, 2022. The train is approaching Big 10 Curve b... (more)

Following Amtrak train 5 a few blocks behind (Amtrak was exiting Tunnel 2 as this train approached West Rocky), the westbound Rocky Mountaineer tour train works toward Big 10 Curve west of Rocky, ... (more)

Amtrak’s westbound California Zephyr climbs out of Rocky, Colorado, on October 12, 2022, with private car “Northern Sky” carrying the markers. This dome-observation “Grand Touring Car” i... (more)

Amtrak’s westbound California Zephyr climbs out of Rocky, Colorado, on Union Pacific’s Moffat Tunnel Subdivision on the morning of October 12, 2022. Trailing the Superliner consist this day is... (more)