Trains under and above ground in the SF bay area. They even go UNDER THE BAY.
Sort of ridic expensive.
A lot of people depend on them so when they strike or break down, everyone's fucked.
Michelle: We can't all fit in your car though, and mine's in the shop!
Monique: I know, we'll take BART!
Barting is in no way pleasureful but could be very amusing to people nearby who recognise the distinguished sound.
Sadly, the scuba diver barted and was viciously aloped by the indigenous aroused blue whale.