San Francisco Municipal Transportation Agency (SFMTA) was the first agency in the US to adopt the floppy-based automatic train control system in 1998. It was supposed to be in place for 20 to 25 years. It entered its 26th year of service in 2024.
In April, SFMTA director Jeffrey Tumlin said the increasing risk of the disks suffering data degradation meant that at some point there will be "a catastrophic failure."