An Enid man was killed about 6:30 p.m. Sunday when the semi tractor-trailer rig he was driving failed to yield at a railroad crossing and was struck by a Union Pacific train south of Kingfisher, according to an Oklahoma Highway Patrol report.

A state medical examiner pronounced Timothy Allan Potter, 52, dead at the scene of the accident at County Road E840, just off U.S. 81, five miles north of Okarche.

Potter was driving west in a 2018 Peterbilt semi registered to Nject Disposal LLC. According to the OHP report, he stopped before he reached the railroad tracks and got out to examine his trailer. The driver then got back into his truck and drove forward into the path of the train, according to the report.

Potter was ejected from the truck, according to the OHP report. The train’s conductor, James Eldon Hardy, 40, of Bison, and passenger Stephen Francis Matt, 22, of Norman, were not reported injured.

Northbound traffic on U.S. 81 was reduced to one lane for more than four hours while the accident was investigated and the wreckage was cleared from the tracks.

The accident is still under investigation by OHP Trooper Mark Williams, who was assisted at the scene by troopers Seth Wallace, Robert Cottrill and Justin Barney, Kingfisher County Sheriff’s Office, Okarche Fire Department and Union Pacific Police Department.