Operators were out for training after more than a year of service being halted due to COVID-19.
RELATED: SF plans to resume cable car services soon, starting with Powell station
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According to the San Francisco Municipal Transportation Association, the cars will officially be back in early September.
In August, passengers will be invited for "mock service" to test the cars before they return later in the fall.
The popular Powell-Hyde line will be the first to return.
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