SFMTA officials said that the issue stemmed from its Market Street subway train control system, which runs on floppy disks that were first installed in 1998 and surpassed their life expectancy last year
A software issue with the San Francisco Muni cipal Transportation Agency’s aging Market Street subway train-control system hampered underground service at downtown stations for about an hour Friday, bringing the agency’s continued reliance on floppy disks back into the limelight.
Erica Kato, an agency spokesperson, told The Examiner that the delay was cleared just before 10:30 a.m. after SFMTA officials finished rebooting the 26-year-old system. Bus shuttles remained temporarily to provide supplemental service, and the agency said it was continuing to monitor its system in case the issue reappeared.
The agency said its train control system was built to last for at most 25 years, meaning that it surpassed its life expectancy in 2023. SFMTA Director Jeffrey Tumlin told KGO this month “that with each increasing year” past the quarter-century lifespan, the “risk of data degradation on the floppy disks increases and that at some point there will be a catastrophic failure.”
Sfmta Muni Subway Service Downtown San Francisco
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