I don't know why this isn't more upvoted. As an SF resident I can confirm that this happened over the holiday (Friday) (I heard a muni station agent mentioned the word hacked, all the gates were open and said "free"). Plus the article has a photo of proof.
The gates seem to be working as of this morning though... I wonder if they paid?
"HDDCryptor not only targets resources in network shares such as drives, folders, files, printers, and serial ports via Server Message Block (SMB), but also locks the drive. Such a damaging routine makes this particular ransomware a very serious and credible threat not only to home users but also to enterprises."