Authorities are investigating the death of an 18-year-old man who was fatally injured when he was struck by an MBTA commuter rail train Monday night in Concord.
The man, whose name was not released, was struck while on the tracks of the Fitchburg commuter rail line around 10:30 p.m. Sunday, according to Transit Police, which is leading the investigation along with Middlesex District Attorney Marian T. Ryan and Concord police.
The incident took place where the tracks run near Nashoba Road, according to Transit Police.
“Foul play is NOT suspected,” Transit Police wrote in a posting on its website.
The Concord death came about an hour after a 17-year-old was seriously injured after he was struck by a Green Line train around 9:15 p.m. Monday, according to Transit Police.
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Police said the teenager unexpectedly walked onto the tracks at Waban Station on the D branch of the Green Line where he was hit by the train.
The teenager, who lives in the area, was taken to the hospital for treatment and is expected to survive, Transit Police said Tuesday.
Police said they do not believe the Waban incident is suspicious.
John R. Ellement can be reached at ellement@globe.com. Follow him on Twitter @JREbosglobe.