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.

“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.

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

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