Expect minimal delays from select 2021 Sunday single-tracking in San Francisco

The 2022 version of this story is available here.

BART crews continue their work replacing aging traction power equipment in San Francisco causing single tracking with minimal delays on select Sundays.

On select Sunday single-tracking, expect up to 10-minute delays from 8 am to 7 pm. We will single track between the 24th Street Mission and Balboa Park stations. Work is also continuing in downtown San Francisco, but single tracking will only happen in one of the two work areas on select Sundays.

There will continue to be 2 line service through the Transbay Tube on Sundays in 2021- the Antioch-SFO (Yellow) line and Dublin/Pleasanton - Daly City (Blue) Line. 

• On Single-tracking weekends Dublin/Pleasanton - Daly City (Blue) Line service will terminate at 24th Street. Passengers traveling further south will cross the platform board the Yellow Line for SFO/Millbrae. On non single-tracking weekends, the Dublin/Pleasanton (Blue) Line will travel to Daly City.
• Sunday service changes vary week to week and riders are encouraged to check the Trip Planner or the official BART app before each trip to see the service plan.

The project has received a major boost in recent months thanks to efforts to accelerate critical rebuilding work during this time of reduced service hours because of the COVID-19 pandemic.  Many of the aging electrical components are nearly 50 years old and have outlived their design lives.  Replacing this outdated infrastructure is essential to ensure BART trains have a reliable power source as they carry riders through the heart of the system. 

Much of the recent focus in downtown San Francisco has been on replacing the 34.5kV (kilovolt) electrical cables that provide power to BART trains. BART has accelerated this project and the increased productivity means the project can potentially eliminate 35 future Sundays when BART would have had to delay riders by running single-track service through the work area.

The entire project in San Francisco is expected to wrap up in late 2023.

Check out our in-depth story and video about this project from 2020.