The San Francisco Muni Metro (local service in San Francisco) is a mix of underground and above-ground lines.
VTA Light Rail (local service for Santa Clara County) is above-ground.
BART (regional service not including Santa Clara County) is a mix of underground and above-ground lines.
Caltrain (regional service SF-Gilroy, which is south Santa Clara County) is above ground, but does have to pass through a few tunnels cut through hills at the SF end of things.
Apple isn't in SF, though. It's in Cupertino. There's no rail service (BART, Caltrain or VTA Light Rail) in Cupertino in the first place. Apple execs and designers are going to drive or can afford to live in the Cupertino hills and surrounding area and bicycle if they want to feel green.
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The San Francisco Muni Metro (local service in San Francisco) is a mix of underground and above-ground lines.
VTA Light Rail (local service for Santa Clara County) is above-ground.
BART (regional service not including Santa Clara County) is a mix of underground and above-ground lines.
Caltrain (regional service SF-Gilroy, which is south Santa Clara County) is above ground, but does have to pass through a few tunnels cut through hills at the SF end of things.
Apple isn't in SF, though. It's in Cupertino. There's no rail service (BART, Caltrain or VTA Light Rail) in Cupertino in the first place. Apple execs and designers are going to drive or can afford to live in the Cupertino hills and surrounding area and bicycle if they want to feel green.