Caltrain is a train, not a subway. I don't know the technical difference, but the trains are bigger and heavier, and the tracks are not elevated or really separ

Caltrain is a train, not a subway. I don't know the technical difference, but the trains are bigger and heavier, and the tracks are not elevated or really separated from their surrounding cities, and the "stations" are really "platforms." In other words, the suicide threat is along the entire length of the route, from SF to San Jose.