Fire crews working near 4th Street and Berry Street threw Muni's T Third line into a slowdown today, forcing trains to creep and then turn back in both directions. Northbound trains were flipped at the Chase Center stop while southbound trains were turned back at 4th & Brannan, with bus shuttles ferrying riders between those switchback points. The shakeup backed up the line and scrambled connections for riders trying to move through SoMa and Mission Bay.
According to SFMTA's post on X, the changes were triggered by “SFFD activity near 4th/Berry” and included switchback operations at Chase Center for northbound trains and 4th/Brannan for southbound trains. The agency said bus shuttles would cover the gap between those locations while crews remained on scene.
ATTN: Due to SFFD activity near 4th/Berry, #TThird will be delayed in both directions.
— SFMTA (@SFMTA_Muni) April 28, 2026
Northbound T trains will switchback at Chase Center.
Southbound trains at 4th/Brannan.
Bus shuttles will provide service btwn the switchback locations.
More: https://t.co/ZfA7VBZtu4
Why the intersection matters
The T Third now runs into the Central Subway and uses 4th & Brannan as a key surface portal into SoMa, so any issue near 4th and Berry can ripple across the line and slow service citywide. As outlined by the City of San Francisco, the Central Subway reroute reshaped how trains move through this corridor and raised the operational stakes for 4th Street stops.
Service changes and event connections
Per the SFMTA weekly transit advisory, 4th Street is a primary connector for Chase Center and the agency regularly runs express or shuttle service for arena events. During today's delay, transit staff set up bus substitution between the switchback points to keep riders moving while emergency responders worked to clear the area.
Rider tips
Riders should pad their travel time, brace for crowded buses and trains, and look at alternate routes such as nearby bus lines or pairing BART with surface transfers when possible. If you need to get through SoMa or Mission Bay this evening, expect longer connections and keep an eye on real-time transit tools for up-to-the-minute updates.
We will update this story if the agency releases more details or once service returns to normal. Until SFFD clears the scene, delays on the T Third are likely to stick around.
