SAN FRANCISCO (CBS SF) — BART riders in San Francisco should expect delays of 15 to 20 minutes Sunday as the transit system single-tracks between the Embarcadero and 24th Street Mission stations to upgrade the electrical traction power system in downtown San Francisco.

Delays could increase to 30 minutes starting at 6:30 p.m., the agency said.

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“During this single tracking we will only have one platform open at Montgomery, Powell, Civic and 16th Street stations,” the district said in an advisory.

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Work and single-tracking delays will continue on every Sunday in November and December, BART said.

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