Bay Area Rapid Transit

Reporting mark: BART
BART - Berkeley Hills Tunnel (Alameda County, California)
Bore completed in 1967, Open for revenue in 1973 they run just north of the Caldecott tunnels
Tunnel under Berkeley Hills on BART (Bay Area Rapid Transport)
Open to traffic

BART - Transbay Tube (San Francisco County, California)
Built 1969; Opened 1974
Tunnel under San Francisco Bay on BART
Open to traffic

BART/SF Muni - Market Street Subway (San Francisco County, California)
Originally built 1973 for Bay Area Rapid Transit, San Francisco Municipal Railway connection added in 1980
Tunnel on Bay Area Rapid Transit & San Francisco Municipal Railway
Open to traffic