An 18-year-old man was struck and killed by a commuter rail train in West Concord Thursday night, according to transit police.

Authorities were called to Conant Street Crossing around 11:30 p.m., police said. The man, who has not been publicly identified, is thought to have been trespassing on the tracks west of the crossing when he was hit by the train.

Officials are continuing to investigate. They don’t suspect foul play.