"The Busses, trains, and streetcars themselves are fine, but the computers that handle ticket and pass purchases were locked out."
https://consumerist.com/2016/11/28/hackers-breached-san-francisco-transit-system-held-it-hostage-all-weekend/
https://consumerist.com/2016/11/28/hackers-breached-san-francisco-transit-system-held-it-hostage-all-weekend/