SF BART Protects Transbay Tube With Night Work

BART single tracking through Transbay Tube causes 20-30 minute delays after 10 p.m. Saturday

BART Delays Hit Transbay Tube Saturday Night

BART riders traveling between San Francisco and the East Bay face delays of 20 to 30 minutes Saturday night, February 21, 2026. Single tracking through the Transbay Tube will slow service after 10 p.m. as crews perform essential lighting work in the underwater tunnel, transit officials said. The work affects one of the system's most critical connections, used by thousands of riders daily.

Essential Infrastructure Work Requires Single Track Operation

The lighting maintenance is part of BART's ongoing infrastructure upkeep for the 3.6-mile Transbay Tube, which opened in 1974 and remains the system's most vital link. Officials said the work must be completed during late-night hours to minimize disruption to the majority of riders. Single tracking means trains must take turns using one track through the tube rather than operating simultaneously in both directions. The specific scope of the lighting work and how many fixtures require maintenance weren't detailed by the agency.

20 to 30 Minute Delays During Late Night Hours

The single tracking configuration will cause delays of 20 to 30 minutes for passengers traveling after 10 p.m. Saturday, according to BART. The reduced capacity means trains can't maintain normal frequencies through the tube, creating cascading delays across transbay routes. Officials didn't specify which specific lines will see the most significant impacts or whether additional trains will be added to other routes to help manage crowding. The work affects all transbay service, including routes connecting San Francisco to Oakland, Berkeley, and other East Bay destinations.

Work Scheduled for Late Saturday Night Only

The single tracking is scheduled for Saturday evening, February 21, 2026, beginning at 10 p.m., BART officials confirmed. The agency didn't provide a specific end time for when normal service will resume. Officials said the late-night timing was chosen to affect fewer riders than daytime or early evening work would impact.

Riders Urged to Plan Extra Travel Time

BART officials recommend passengers traveling Saturday night allow an additional 20 to 30 minutes for trips through the Transbay Tube and consider alternative transportation if timing is critical. The agency said riders should check for real-time updates before heading to stations. Moovit provides real-time BART service information and delay alerts to help riders plan around the single tracking and adjust their travel schedules accordingly.