Wyoming's Interstate 80 will be crawling with railroad enthusiasts over the next two weeks as the world's only operating Big Boy locomotive returns to the rails, and state troopers are urging drivers to stay alert.

Union Pacific's Big Boy No. 4014 will leave Cheyenne with the Living Legend No. 844 this Saturday following a 9:30 a.m. christening ceremony at the Cheyenne Depot and arrive in Ogden, Utah on May 9.

WATCH: A Film Of the Last Time ‘Big Boy’ Left Cheyenne [VIDEO]

The historic steam locomotives will travel parallel to I-80, stopping in communities along the way to and from Ogden, and will get back into Cheyenne on May 19.

“We want our citizens and visitors who will be viewing the upcoming railroad events to be safe,” said Sgt. Jeremy Beck with the Wyoming Highway Patrol. “We’re urging everyone to pay attention to their surroundings, plan extra time for travel and not drive distracted.”

Beck says it's illegal to stop or park on the side of I-80 or along overpasses and bridges, and violators could be fined up to $235.

“Speeds along I-80 can be anywhere from 75 to 80 mph, which makes it extremely dangerous for motorists to pull over,” said Beck. “For everyone’s safety, please park in designated areas in communities the trains will be passing through.”

Beck says troopers will be working extra shifts during the event to ensure the safety of the motoring public.

No. 4014 and No. 844 are touring the Union Pacific system throughout 2019 to commemorate the transcontinental railroad's 150th anniversary.​

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