The opening to the week’s morning commute on BART turned into another exercise in frustration for riders Monday, when the agency had to close two of its travel lines because of an equipment problem, officials said.

Trains moved through the TransBay Tube on only one track, and direct service on its Red Line and Green Line were completely down until about 6:20 a.m., the agency said. At 6:20 a.m., BART issued a service directory that indicated the Green Line had re-opened.

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The issues were causing a 20-minute delay through the tube and in all other directions.

Passengers on the Red and Green lines were encouraged to catch a Yellow Line train running from San Francisco to Antioch at a transfer station.

The Red Line runs from Richmond to Millbrae, while the Green Line serve

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