The first occurred on Monday at 11:30 a.m., when a woman reportedly sat down on the tracks just north of the San Antonio train station. The woman, later identified as 29-year-old Heather Russell of Palo Alto, entered the southbound tracks behind an apartment complex on Del Medio Avenue at the Mountain View/Palo Alto border, according to officials.
The area, which is surrounded by shrubbery and not easily seen, is one of the few access points not barricaded by a tall chain-link fence.
"She sat down between the gauge of the tracks. The engineer went into emergency braking and honked the horn, then the train struck her," said Detective Victor Lopez of the San Mateo County Sheriff's Office Transit Police Bureau.
The second possible suicide happened Tuesday at about 8:30 a.m., after a train hit a Gunn High School student on the tracks near East Meadow Drive in Palo Alto. Investigators said the victim, described as an Asian male and a junior at the high school, walked around the crossing arms just before a northbound commute train hit him.
Both victims died at the scenes. Caltrain was delayed both Monday and Tuesday morning as trains were single-tracked around the accidents. The Santa Clara County coroner is investigating the incidents.
The Caltrain-related deaths are the first and second for 2009. Last year there were 16 Caltrain-related deaths, 13 of which were categorized as suicides.