Caltrain reporting markJPBX is a California commuter rail line on the San Francisco Peninsula and in the Santa Clara Valley (Silicon Valley) in the United States. It is currently operated under contract by Amtrak and funded jointly by the City and County of San Francisco, San Mateo County Transit District, and Santa Clara Valley Transportation Authority through the Peninsula Corridor Joint Powers Board. The northern terminus (terminal station) of the rail line is in San Francisco (San Francisco, California), at 4th and King streets; its southern terminus is in Gilroy (Gilroy, California). Trains operate out of San Francisco and San Jose on an approximately hourly basis every weekday, with more frequent service provided during commute hours and for special events (such as sporting events). Service between San Jose and Gilroy is limited to three daily commute-hour round trips. Average weekday ridership in February 2008 was 36,993 persons.

Caltrain has 29 regular stops, one football (American football)-only stop (Stanford Stadium), and two weekend-only stops (Broadway and Atherton). Caltrain operates a mix of 90 local, limited, and express weekday trains, with 32 and 28 hourly local trains on Saturdays and Sundays, respectively. Caltrain route