The Bay Area Rapid Transit (BART) system is the fast, easy, inexpensive way to travel around the Bay Area. Trains from the East Bay go through the Transbay tube and under the San Francisco Bay to/from San Francisco and cities on the San Francisco Peninsula to San Francisco International Airport.
Muni operates bus, streetcar and cable car lines. Buses and streetcars are referred to interchangeably as Muni, but when streetcars run underground beneath Market St, they are called the Muni Metro