SAN FRANCISCO (CBS SF) — Muni rail service is shutting down in San Francisco again for the next several weeks starting Tuesday, three days after it resumed following five months of being suspended due to the COVID-19 pandemic.

The Muni Metro system had resumed Saturday but is shutting down for the foreseeable future after two splices in the subway overhead wire failed and someone in the system’s control center tested positive for COVID-19.

Starting Tuesday, all rail service will be provided by bus. More details about how the closures are affecting various lines can be found at sfmta.com/travel-updates/bus-substitution-all-rail-lines.

Jeffrey Tumlin, director of transportation for the San Francisco Municipal Transportation Agency, wrote on Twitter about the problems and apologized to Muni riders who will be affected.

Tumlin said contact tracing protocols mean other controllers in Muni’s Transportation Management Center will be in quarantine.

“Our rail system has small teams of amazing technical experts. The system doesn’t work if a few of them are out,” he wrote. “It was fear of this scenario that caused us to shut system in April.”

Tumlin said agency officials will be working through the night to rebuild Muni’s bus schedule for the third time since April, with delays expected Tuesday morning.

“While today’s troubles expose the vulnerabilities of our rail system, they also show the phenomenal resiliency of our buses, and confirm the hard choices we made back in April. COVID is forcing all systems to be more resilient and adaptable,” he wrote.

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