Earlier this month, SEPTA, Philly’s public transportation network, experienced a malware attack that shut down real-time data for riders, access to internal servers and email for SEPTA employees.

Riders and employees first started experiencing problems on Monday, Aug. 10, The Philadelphia Inquirer reported, and experienced problems for at least two weeks. The malware (aka malicious software) attack also caused SEPTA to shut down access to payroll and remote timekeeping, and SEPTA’s headquarters at 12th and Market streets didn’t have internet as of Monday.

Most noticeably felt by riders was the lack of real-time data usually available in SEPTA mobile app, or on time boards at stations. It’s a function only rolled out by the transit authority in 2016, when SEPTA began installing cellular modems on every vehicle to track their location and status.

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