The collision was reported last Thursday at 10:10 p.m. on the southbound tracks south of Charleston Road, Caltrain spokeswoman Christine Dunn said.
He was a software engineer at Facebook and co-founder of Flok, a digital and social-media marketing company, according to his LinkedIn page.
Train service was stopped in both directions as emergency crews responded. Dunn said 220 passengers were aboard the train, No. 192, when the collision occurred.
The fatal collision occurred about half hour after a separate incident on East Meadow Drive in which a car got stuck on the Caltrain tracks. Palo Alto police responded to the scene and a tow truck was called in to remove the car, Dunn said.
The stranded vehicle was not related to He's death, Dunn said. Transit Police Det. Victor Lopez said on Tuesday that the vehicle became stuck accidentally.