Caltrain is a California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 commuter rail line on the San Francisco Peninsula

San Francisco Peninsula

The San Francisco Peninsula is a peninsula in the San Francisco Bay Area that separates the San Francisco Bay from the Pacific Ocean. On its northern tip is the City and County of San Francisco. Its southern base is in Santa Clara County, including the cities of Palo Alto, Los Altos, and Mountain...

 and in the Santa Clara Valley

Santa Clara Valley

The Santa Clara Valley is a valley just south of the San Francisco Bay in Northern California in the United States. Much of Santa Clara County and its county seat, San José, are in the Santa Clara Valley. The valley was originally known as the Valley of Heart’s Delight for its high concentration...

 (Silicon Valley

Silicon Valley

Silicon Valley is a term which refers to the southern part of the San Francisco Bay Area in Northern California in the United States. The region is home to many of the world's largest technology corporations...

) in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. The northern terminus

Terminal Station

Terminal Station is a 1953 film by Italian director Vittorio De Sica. It tells the story of the love affair between an Italian man and an American woman. The film was entered into the 1953 Cannes Film Festival.-Production:...

 of the rail line is in San Francisco

San Francisco, California

San Francisco , officially the City and County of San Francisco, is the financial, cultural, and transportation center of the San Francisco Bay Area, a region of 7.15 million people which includes San Jose and Oakland...

, at 4th and King streets; its southern terminus is in Gilroy

Gilroy, California

Gilroy is the southernmost city in Santa Clara County, California, United States. The population was 48,821 at the 2010 census. Gilroy is well-known for its garlic crop and for the annual Gilroy Garlic Festival, featuring various garlicky foods, including garlic ice cream. Gilroy also produces...

. 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.