MBTA commuter trains are experiencing a 50 to 60 minute delay this morning due to an early morning fatality in W. Newton. All three Wellesley stations are affected by the delay.

A man died Tuesday morning after he slipped and fell under an MBTA commuter train, traveling inbound, at the West Newton rail station, according to officials.

The incident is under investigation, says Newton Fire Asst. Chief Bruce Proia, and emergency personnel are still on scene. Police received a 911-emergency phone call from the platform at 7:48 a.m., he said.

The Framingham/Worcester commuter rail line has bus service running from Wellesley Farms to Newtonville. Commuters earlier today were bussed between Wellesley Farms and Newtonville.

Transit Police are interviewing passengers who might have witnessed the incident.

Anyone with information about the incident is asked to contact the Transit Police at 617-222-1050.

Update 4:20 p.m.:

James J. Callahan Jr., 74, of West Newton, is the deceased, according to MBTA spokesman Joe Pesaturo.

The Framingham/Worcester commuter rail line fully reopened at 9:45 a.m., and passengers are not expected to face delays on their evening commute, he said.

Reports were contributed by John Waller.