The California Zephyr runs through the cut that leads to Rocky, Colorado as it heads up the Moffat Tunnel Sub.

Amtrak engine #83 (P42DC) leads the California Zephyr through Little Ten Curve at Rocky, Colorado.

The California Zephyr makes the S curve at Rocky, Colorado.

Snow is falling fast as UP 6276 (ES44AC) leads an oil can train through Rocky, Colorado.

UP 6276 (ES44AC) brings an oil can train through Rocky, Colorado on the Moffat Tunnel Sub during a spring snowstorm.

Kansas City Southern 4765 (ES44AC) leads a Union Pacific train through Big Ten Curve as it drops down grade on the Moffat Tunnel Sub.

After holding for the California Zephyr, KCS 4765 (ES44AC) leaves the siding at Rocky, Colorado and will soon arrive in Denver.

KCS 4765 (ES44AC) holds on the siding at Rocky, Colorado to let the California Zephyr pass.

The California Zephyr climbs Big Ten Curve as it heads up the 2% grade on the Moffat Tunnel Sub.

UP 6643 (AC4400CW) leads a coal train down the hill from Big Ten Curve as the single DPU at the rear of the train enters the curve from the top.

The California Zephyr runs through 'The Cut' as it heads towards Rocky, Colorado on the Moffat Tunnel Sub.

UP 6276 (ES44AC) is framed by the trees at Rocky, Colorado.

The California Zephyr meets a Kansas City Southern train waiting on the siding in Rocky, Colorado.

Oil From Arena and Big Ten
Significant spring snow is clearing from the foothills of the Front Range near Big Ten while loaded oil is slowly working it’s way into Denver.

The California Zephyr gets a run-by observation from the conductor on the KCS coal train waiting on the Rocky siding. After the Zephyr passes the coal train will head to Denver.