CALDWELL -- A Nampa man who was driving a semi truck was killed Thursday morning when his truck was struck by a train in Caldwell.

The collision happened at about 10 a.m. on Look Lane at the Union Pacific railroad tracks, northwest of Caldwell.

Idaho State Police said 61-year-old Floyd C. Gibson was the only person in the semi when it was hit, according to ISP. He was pronounced dead at the scene.

Police said Gibson was southbound in a 1997 Kenworth that was towing a gravel trailer. He failed to yield at a stop sign and was struck by an eastbound Union Pacific locomotive.

Gibson, who wasn't wearing a seat belt, was ejected and died at the scene.

Look Lane has a stop sign before the train tracks, but no crossing arm to warn drivers a train is approaching.

ISP Trooper Donnie Heida said it was impossible for the Union Pacific train to stop in time.

"Unfortunately, trains carry a significant amount of weight, so they can't just hit the brakes like a vehicle does," he said. "As you can see, it traveled at least a good distance after striking the commercial vehicle. The train probably saw the commercial vehicle, and there was nothing they can do about it."

The signage on the semi trailer indicates it belongs to a Nampa company.