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DENVER -- Investigators say the pedestrian that was struck and killed by one of Union Pacific's historic steam trains was taking pictures of the locomotive and apparently ventured too close to the tracks.

The 21-car train, being pulled by Locomotive 844, was returning Saturday evening from a day-long trip to Cheyenne Frontier Days.

The train, called the 'Denver Post Special,' because the trip was sponsored by the Post, was southbound, and had just arrived at the 124th Avenue crossing near Henderson, at 7:45 pm, when the accident happened.

"We are working with local authorities to see what happened leading up to the crash," said Union Pacific spokeswoman Kristen South.

The Adams County Sheriff's Office and Commerce City Police were at the scene shortly after the accident, but the Sheriff's Office said, "Union Pacific is leading the investigation."

Passengers were bused back to Denver.

The train remained at the scene for several hours.

The victim was among several photographers that were snapping photos of the train on it's return trip.