Overview
- Service will be suspended between Senefelderplatz and Stadtmitte while BVG swaps signalling equipment and conducts required system and software tests.
- Rail replacement buses will operate on the closed section, though riders making through trips are advised to reroute via other U-Bahn lines or the S-Bahn.
- The new electronic interlocking at Alexanderplatz will govern the Rosa-Luxemburg-Platz–Spittelmarkt section as part of a long-term program to digitize 35 interlockings, 13 completed so far.
- BVG is receiving roughly one new Stadler train per week and plans to have 140 cars in service by year-end to support a return to four-minute intervals on 13 January 2026.
- The upgrade supports BVG’s path to partial automation, with CBTC launches planned on U5 in 2029 and U8 in 2032 and possible application to additional lines such as U2.