Expect delays from Sunday single tracking through downtown SF; next date impacted is 4/5


Expect delays from Sunday single tracking through downtown SF; next date impacted is 4/5

To upgrade the electrical traction power system in Downtown San Francisco we need to single track trains in San Francisco on some Sundays throughout the year.  This means trains will need to take turns to run on only one track between Embarcadero and 24th Street Mission.   This electrical work is critical for ensuring our trains have a reliable power supply.

The next scheduled single tracking for this project will be Sunday, April 5. 

2020 single tracking dates include: April 5, April 19, April 26.

Expect 10 minute delays from 8 am to 6:30 pm and up to 20 minute delays when crews are moving equipment between 6:30 pm and 8 pm. We will single track between the Embarcadero and 24th Street Mission stations. During this single tracking we will only have one platform open at Montgomery, Powell, Civic and 16th Street stations.

Single tracking may impact our ability to make the Richmond/Antioch timed transfers meets (northbound).

San Francisco line Cable Replacement photo

Crews work to replacing cables and pipes in Downtown San Francisco.

BART will continue to single track between the Embarcadero and 24th Street Mission stations on approximately 28 Sundays per year through 2021. Once that phase of the cable replacement is complete, the second phase will bring the same work to the San Francisco line between the 24th Street Mission and Balboa Park stations.  The second phase is scheduled to begin in 2022 and it's not clear if it will require single tracking.

With the new schedule change on February 2020, we will maintain 24-minute headways. Impact include:

  • Two lines -- the Antioch-SFO (Yellow) line and Dublin/Pleasanton - Daly City (Blue) Line --  will provide service through the Transbay Tube.
  • On Single-tracking weekends Dublin/Pleasanton - Daly City (Blue) Line service will terminate at Montgomery St. 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.
  • Trips to Millbrae will no longer require a transfer at SFO on Sundays. The Sunday map below still shows the "Purple line," but with no transfer bubble. The Sunday trains will be labelled as "SFO/Millbrae" bound trains on platform signs and we will make on board announcements so Sunday riders know they don't need to transfer at SFO to a Millbrae train. 

Check Before You Go

The new schedule has been loaded into the Trip Planner on bart.gov as well as the official BART app. Select a date Feb. 11th and beyond to see how these changes impact your trip.  

Sunday riders are encouraged to check the Trip Planner or the app before each trip as it varies week by week based on single tracking weekends.

Power Cable Upgrades 

The Sunday service change is to accommodate the replacement of 34.5kV power cables and pipes that power our trains. It’s original hardware dating back to when the system was built. The nitrogen-filled pipes are being replaced with modern shielded cabling using Measure RR funds. 

The power to run our trains comes from a variety of original sources like solar and natural gas. After we get it from PG&E (but before it gets sent into the electrified third rail), it must be distributed through substations and special cabling at 34.5 kilovolts (kV).  

San Francisco line Cable Replacement close-up photo

San Francisco line Cable Replacement wide shot

(Photo credit: Eric Londgren)

At BART, much of the cabling technology and substations channeling all this energy is outdated and in a state of age-related disrepair.  The 34.5 kV cables themselves don’t even really resemble what the average person would imagine a cable to be: they’re quite large and encased within nitrogen-filled pipes about the circumference of a grapefruit. The 34.5 kV cables run through these pipes. 

BART needs to replace these pipes, cables (34.5kv), and substations with modern shielded cabling and new distribution hardware so the power can be properly stepped down and fed into the 1000-volt, electrified third rail.  The third rail is what brings power to the train cars, via conductive metal collector shoes skimming along the third rail’s surface.  

Sunday map starting February 2020