Text from BVG website:
"Strike on Wednesday, March 19th and Thursday, March 20th, 2025
Verdi will be on strike at the BVG: subways and trams as well as most BVG buses will be at a standstill on Wednesday, March 19th and Thursday, March 20th, 2025.
During the strike, all subways and trams as well as most buses will be cancelled. We ask for your understanding that traffic may still be irregular for a few hours after the strike ends on Friday morning at approx. 3:00 a.m.
Passengers may use the S-Bahn and regional trains as well as the shared mobility providers via Jelbi as an alternative."
More details: https://www.bvg.de/en/strike