Caltrain is a commuter rail line in California, serving the San Francisco Peninsula and Santa Clara Valley. The southern terminus is in San Jose at the Tamien station, with weekday rush-hour service extending to Gilroy. The northern terminus of the line is in San Francisco at 4th and King Street. Caltrain has express, limited, and local services. There are 28 regular stops, one limited-service weekday-only stop, one weekend-only stop (Broadway), and one stop that is only served on football game days (Stanford). While average weekday ridership in 2019 exceeded 63,000, impacts of the COVID-19 pandemic have been significant: in March 2026, Caltrain had an average weekday ridership of 41,968 passengers.