Caltrain is a California commuter rail line serving the San Francisco Peninsula and Santa Clara Valley. The southern terminus is in San Jose at 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 Streets. Caltrain has 28 regular stops, one limited-service weekday-only stop, one weekend-only stop (Broadway), and one football-only stop (Stanford). While average weekday ridership in 2019 exceeded 63,000, impacts of the COVID-19 pandemic have been significant: in August 2022, Caltrain had an average weekday ridership of 18,600 passengers.
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 between Lick Avenue and State Route 87, just north of Alma Avenue.
Downtown Mountain View station is an intermodal transit station providing public bus and rail service, located in Mountain View, California. The station is served by the Caltrain commuter rail service, for which it is simply called Mountain View station. Santa Clara VTA Orange Line light rail service is provided to an adjacent, dedicated light rail facility, known as Downtown Mountain View station. VTA local transit bus and employer-operated shuttle services are accommodated from the Mountain View Transit Center on the Evelyn Avenue side of the station.
Palo Alto station is an intermodal transit center in Palo Alto, California. It is served by Caltrain regional rail service, SamTrans and Santa Clara VTA local bus service, Dumbarton Express regional bus service, the Stanford University Marguerite Shuttle, and several local shuttle services. Palo Alto is the second-busiest Caltrain station after San Francisco, averaging 7,764 weekday boardings by a 2018 count. The Caltrain station has two side platforms serving the two tracks of the Peninsula Subdivision and a nearby bus transfer plaza.
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.
Broadway station is a Caltrain station in Burlingame, California. Caltrain only serves the stop on weekends and holidays; weekday service is provided by a bus shuttle to nearby Millbrae station.
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 southernmost terminus of the Caltrain system, and is only served during weekday rush hours in the peak direction, with trains going toward San Francisco 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.
Paul Avenue was a Caltrain station located in the Bayview neighborhood of San Francisco, California. The lightly used station was closed on August 1, 2005, and the platform and shelter were removed in 2009. A replacement station to the north has been proposed.
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, will be increased to four weekday round trips on September 25, 2023.
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 during weekday peak hours, with northbound trains in the morning and southbound trains in the evening. Service between San Jose and Gilroy, including San Martin station, will be increased to four weekday round trips on September 25, 2023.
The Caltrain Express (CTX) project was implemented from 2002 to 2004 and led to the establishment of the Baby Bullet express service, which shortened the transit time 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 is up to 20% faster than driving south from San Francisco to San Jose.
The Caltrain Modernization Program (CalMod), sometimes referred to as the Caltrain Electrification Project, is a $2.44 billion project that will add a positive train control (PTC) system and electrify the main line of the U.S. commuter railroad Caltrain, which serves cities in the San Francisco Peninsula and Silicon Valley, as well as transition from its current diesel-electric locomotive powered trains to electric multiple units (EMU). According to Caltrain, electrification of the tracks will allow it to improve service times via faster acceleration and shorter headways, reduce air pollution and noise, and facilitate a future railway tunnel into downtown San Francisco's Salesforce Transit Center, as diesel trains cannot serve underground stations.
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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