Caltrain is a commuter rail line serving the San Francisco Peninsula and Santa Clara Valley in California.
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Caltrain is a California-based commuter rail service that connects the San Francisco Peninsula with the Santa Clara Valley, including the Silicon Valley region. The rail line extends from San Jose at Tamien Station, with weekday rush hour service reaching as far as Gilroy, to the northern terminus in San Francisco at 4th and King Street. The service includes 28 regular stops, with additional limited-service and special event stops. Caltrain has undergone significant changes in ridership, particularly affected by the COVID-19 pandemic, and is undergoing an electrification process to improve its efficiency and environmental footprint.
Caltrain's roots can be traced back to the original commuter railroad built in 1863 by the San Francisco & San Jose Railroad, later purchased by Southern Pacific (SP) in 1870. SP made several improvements, including double-tracking the line in 1904, but faced ridership decline post-1945. The California Department of Transportation (Caltrans) intervened in 1980 to preserve the commuter service, contracting with SP and subsidizing the Peninsula Commute. In 1987, the Peninsula Corridor Joint Powers Board was formed to manage the line and eventually purchased the railroad right of way between San Francisco and San Jose from SP in 1991. The following year, PCJPB took responsibility for Caltrain operations, selecting Amtrak as the contract operator, and extended service to Gilroy, making it more accessible to a broader range of passengers.