MENLO PARK -- The death of a 16-year-old Menlo Park boy who was struck by a commuter train on the tracks north of Encinal Avenue on Monday is being investigated as a possible suicide, according to the San Mateo County Coroner's Office.

The boy was hit at 4:22 p.m. just north of the Encinal Avenue rail crossing, according to Jayme Ackemann, communications manager for Caltrain. It disrupted the evening commute between Redwood City and Palo Alto, with some trains delayed as much as an hour and a half.

The death was the 13th this year on Caltrain tracks. Last year, 12 people were killed on the Caltrain right of way, with eight of those considered suicides.

Contact Eric Kurhi at 408-920-5852. Follow him at Twitter.com/erickurhi.