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 running as far as 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 and holiday-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 June 2024, Caltrain had an average weekday ridership of 24,580 passengers.
Millbrae station is an intermodal transit station serving Bay Area Rapid Transit (BART) and Caltrain, located in Millbrae, California. The station is the terminal station for BART on the San Francisco Peninsula, served by two lines: The Red Line before 9 pm and the Yellow Line during the early morning and evening. It is served by all Caltrain services. The station is also served by SamTrans bus service, Commute.org and Caltrain shuttle buses, and other shuttles.
Tamien station is an intermodal passenger transportation station in the Tamien neighborhood of central San Jose, California, served by the VTA light rail and the Caltrain commuter rail line, along with bus connections. The station has two elevated island platforms, one for each service. The two platforms are connected by a walkway at ground-level that is below the two platforms. The light rail platform is located in the center median of the State Route 87 freeway just north of the Alma Avenue overpass. The Caltrain platform is located just to the east, between Lick Avenue and State Route 87 and just north of Alma Avenue.
Santa Clara Transit Center is a railway station in downtown Santa Clara, California. It is served by Caltrain, Amtrak Capitol Corridor, and Altamont Corridor Express (ACE) trains. It is the planned terminus for the Silicon Valley BART extension into Santa Clara County on the future Green and Orange Lines. The former station building, constructed in 1863 by the San Francisco and San Jose Railroad, is used by the Edward Peterman Museum of Railroad History.
22nd Street station is a Caltrain commuter rail station located south of 22nd Street between the Dogpatch and Potrero Hill neighborhoods of San Francisco, California beneath the Interstate 280 freeway viaduct. The only below-grade Caltrain station, it is bracketed on the north and south by two tunnels which take the line under the eastern slope of Potrero Hill. The station is also served by Muni routes 48 and 55.
Bayshore station is a Caltrain commuter rail station in the Visitacion Valley neighborhood of San Francisco, California. The station is on the border of San Francisco and the neighboring city of Brisbane. The parking lot and the northern section of the station are in San Francisco, while the remainder is in Brisbane. The station address is in San Francisco proper.
South San Francisco station is a Caltrain station in South San Francisco, California. The station is on the east side of the Bayshore Freeway, east and south of the curved Grand Avenue overpass, and north of where the freeway crosses over the tracks. Downtown South San Francisco is to the west, across the freeway. It previously underwent a substantial modernization and expansion project, completed in January 2022.
San Bruno station is a Caltrain station located in San Bruno, California. The station is located just northeast of downtown San Bruno, above the intersection of San Mateo and San Bruno Avenues, adjacent to Artichoke Joe's Casino.
San Mateo station is the northernmost of the three Caltrain stations in San Mateo, California. It is in downtown San Mateo.
Hillsdale station is one of three Caltrain stations in San Mateo, California. The station is next to the Bay Meadows neighborhood and close to the Hillsdale Shopping Center.
Gilroy station is a Caltrain station located in Gilroy, California, United States. It is the southern terminus of the South County Connector service, and is only served during weekday rush hours in the peak direction, with trains going toward San Jose in the morning and returning southbound in the evening. The station building was constructed by the Southern Pacific Railroad in 1918 and restored in 1998. Future plans call for extended Amtrak Capitol Corridor service, as well as California High-Speed Rail trains, to also stop at Gilroy. The station was named to the National Register of Historic Places in 2019 as Gilroy Southern Pacific Railroad Depot.
Lawrence station is a Caltrain commuter rail station in Sunnyvale, California. The station has four tracks with side platforms serving the outer tracks.
Capitol station is a Caltrain station located off Monterey Road near the Capitol Expressway, after which the station is named, in southern San Jose, California. The station is only served during weekday peak hours, with northbound trains in the morning and southbound trains in the evening. Service between San Jose and Gilroy, including Capitol station, was increased to four weekday round trips on September 25, 2023.
Blossom Hill station is a Caltrain station located off Monterey Road near the Blossom Hill Road expressway in San Jose, California. The station is only served during weekday peak hours, with northbound trains in the morning and southbound trains in the evening.
Morgan Hill station is a Caltrain station located in the downtown area of Morgan Hill, California. The station is only served during weekday peak hours, with northbound trains in the morning and southbound trains in the evening.
San Martin station is a Caltrain station located in the downtown area of San Martin, California. The station is only served by South County Connector service during weekday peak hours, with four northbound trains to San Jose in the morning and four southbound trains to Gilroy in the evening.
The Caltrain Express Program (CTX) was implemented from 2002 to 2004 to establish the Baby Bullet express service, which shortened the transit time on the Caltrain commuter rail line between San Francisco and San Jose, and certain stations in between. New locomotives and rolling stock were purchased for dedicated express service, bypassing most stations; quad-track overtake sections were added in two locations along the Peninsula Corridor right-of-way to allow express trains to pass slower local trains that were making all stops; tracks were also upgraded with continuous-welded rail; a centralized traffic control system was added; and crossovers were added every few miles to allow single-tracking trains around disabled trains. Congresswoman Jackie Speier, then serving as a California State Senator, is credited with securing the funding for CTX and one of the new locomotives acquired for the project is named for her as a result. During commute hours, the Baby Bullet went up to 20 percent faster than driving south from San Francisco to San Jose. On September 21, 2024, with the completion of the Caltrain modernization project and the transition to electrified trains, the Baby Bullet was renamed as simply the Express service.
The Caltrain Modernization Program (CalMod), sometimes referred to as the Caltrain Electrification Project, was a $2.44 billion project which added a positive train control (PTC) system and electrified the main line of the U.S. commuter railroad Caltrain, which serves cities in the San Francisco Peninsula and Silicon Valley. The electrification included installation of a 25 kV catenary system over the double-tracked line from San Francisco to San Jose, and acquisition of new rolling stock, consisting of Stadler KISS double-decker electric multiple units (EMU). Caltrain has transitioned from its legacy push-pull trains hauled by diesel-electric locomotives, most of which have been in service since 1985.
The Monterey County Rail Extension is a planned commuter rail extension that would bring Caltrain passenger service south of its existing Gilroy, California terminus to Salinas in Monterey County, using the existing Coast Line owned by Union Pacific (UPRR). Implementation of the rail extension will occur over three phases, starting from Salinas and moving north. When construction is complete, there will be four trains operated over the extended line per weekday: two northbound trains that depart from Salinas and travel to San Francisco in the morning, and two southbound trains that return to Salinas in the afternoon.
VTA: 20, 21, 53, 55, Rapid 523 
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