The man was apparently lying on the tracks when he was hit by a Union Pacific train.
The conductor was not able to stop in time.
Investigators have not yet determined if the man was alive when the train hit him.
Earlier in September, two people were killed in Mission Viejo when they were run over by a train while they were sleeping on the tracks.
Also in September, there was a fatality in Riverside. In that incident, the victim was struck as she walked along the tracks.
Both incidents involved Metrolink trains.
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