After stopping at Magra to let traffic ahead clear, Amtrak No. 6 accelerates up the steep Donner grade.

"Hey! Over here! Don't miss me!" yells a friendly crew member, eliciting a smile from the photographers watching the eastbound California Zephyr pull out of Truckee.

Amtrak No. 6 prepares to depart 16th Street Station in Oakland.

Amtrak's eastbound California Zephyr has just emerged from Moffat Tunnel and will begin its descent down the Front Range into Denver.

A well tuned quartet of F40PH engines pull the California Zephyr train No. 6 less than 10 minutes from its scheduled stop at Provo, Utah on May 15, 1989.

With four additional Amtrak cars including the Beach Grove observation car, the California Zephyr train No. 6 climbs toward Soldier Summit on June 5, 2016. Amtrak President and CEO Joseph H. Board... (more)

With Amtrak's Phase 1 Heritage P42DC in the lead and the last Siemens ACS-64 delivery trailing, a 14 car California Zephyr glides through Wellington Canyon east of Wash on June 5, 2016.

With Amtrak's Phase 1 Heritage P42DC in the lead and the last Siemens ACS-64 delivery trailing, a 14 car California Zephyr curves through Spanish Fork Canyon just after sunrise on June 5, 2016.

The eastbound California Zephyr runs through a classic location on the former Rio Grande.

Eastbound California Zephyr, No. 6, charges up the west slope of Donner Pass in the Sierra Nevada Mountains, to the Summit at Norden.

Amtrak’s eastbound California Zephyr drops downgrade through Clay, Colorado, on March 16, 2011. In the background directly above the locomotives is “Little 10 Curve,” where the train will be... (more)

The eastbound California Zephyr, No. 6, exits the Florinston Narrows along with the Truckee River. Both mains and the river crowd together through the Narrows.

The eastbound California Zephyr is cruising along the former Rio Grande east of Thompson Springs, Utah early on a glorious spring day.

Union Pacific substitute power leads Amtrak's California Zephyr on Rio Grande rails in Utah's Happy Valley on July 21, 1990.

On a clear Friday, February 26, 2016, Amtrak's eastbound California Zephyr cruises through New Castle, CO.