Caltrain operates a regional rail service from San Jose to its San Francisco terminal at Fourth and King. The service also runs between San Jose and Gilroy during rush hour. Caltrain is very useful for travel between San Francisco and cities of the Peninsula, Silicon Valley or South Bay. On weekdays Caltrain provides two trains per hour for most of the day but run more during commute hours, including "Baby Bullet" limited services that cruise between San Francisco and San Jose in 57 minutes; on weekends and public holidays trains run hourly, except that after 10PM only one train runs, leaving at midnight. The 4th & King terminal is served by Muni Metro giving connections to the rest of the city. Fares vary depending on how far you go. Tickets must be purchased before boarding the train from ticket vending machines at any of the stations or from ticket clerks at staffed stations. Tickets are checked on the trains and anyone found without a ticket is liable to a substantial fine. Cyclists should use the designated car at the northern end of the train, and be aware that bike space is often limited during commute hours.