A man was struck and killed this morning by a northbound Caltrain on the tracks at Ravenswood Avenue in Menlo Park, according to a Caltrain spokeswoman.

It was the fourth fatality on Caltrain tracks this year.

The fatal collision happened at 9:30 a.m., according to Caltrain spokeswoman Christine Dunn.

The fatality interrupted service for about two hours. At 11:50 a.m., north and southbound tracks reopened for maximum speed.

Contact Mark Gomez at 408-920-5869. Follow him on Twitter @MarkMgomez