A man was struck and killed by a commuter rail train in Acton this afternoon, according to the MBTA Transit Police.

The man in his 20s was hit around 3:55 p.m. by an inbound Fitchburg line train, Transit Police said. He was struck about 200 yards east of South Acton Station, said Joe Pesaturo, a spokesman for the MBTA.

The incident remains under investigation and no further information was available.

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The Massachusetts Bay Commuter Railroad Co. tweeted out that passengers who use the Fitchburg line should expect delays from 45 to 60 minutes due to the investigation.