It's over double area median income. It's simply not the case that it's just enough to survive or anything like that. Those people could afford to live almost anywhere in the bay area easily.

The part that makes it corruption is that BART is overpaying to pad the pockets of specific more senior members of the union at the expense of less senior members and the public.

To make it concrete, I have a very nice and spacious apartment in a good location in SF. Around 85% of BART employees could easily afford my apartment, based on public data (less than 30% one month pay).