The Golden Gate Bridge, Highway and Transportation District is a special-purpose district that owns and operates three regional transportation assets in the San Francisco Bay Area: the iconic Golden Gate Bridge, the Golden Gate Ferry system and the Golden Gate Transit system. All three assets connect Marin County with San Francisco. In the 1950s and 60s, officials in charge of the Golden Gate Bridge District coordinated to kill the popular BART extension into Marin County in order to preserve their own toll revenues.
Sonoma–Marin Area Rail Transit (SMART) is a rail line and bicycle-pedestrian pathway project in Sonoma and Marin counties of the U.S. state of California. When completed, the entire system will serve a 70-mile (110 km) corridor between Cloverdale in northern Sonoma County and Larkspur Landing in Marin County. In 2023, the system had a ridership of 749,700, or about 2,700 per weekday as of the fourth quarter of 2023.
A SMART train at Santa Rosa Downtown station in 2018
A northbound SMART train crosses the Petaluma River on a drawbridge previously used on the Galveston Causeway in Texas. Note US 101 on the taller bridge in the background.
SMART connects with ferries bound for San Francisco at Larkspur Ferry Terminal
South portal of Cal Park Hill Tunnel showing rails and path, November 2018