What caused the nationwide communications outage that brought all German rail traffic to a standstill on June 24, 2026?

The trains halted because the digital radio system that keeps everything coordinated had a severe glitch.

• The immediate technical fault: A nationwide failure in the GSM-R (Global System for Mobile Communication for Railways) system – the secure digital network used for voice and data between train drivers, dispatchers, and control centers [2][5][8][12].
• What triggered it: The GSM-R problem was set off by scheduled maintenance on a communications system [13]. So a routine update or check went sideways.
• What it wasn’t: There is no evidence it was a cyberattack, nor was it physical infrastructure damage [7].

A few outlets also noted that Deutsche Bahn said the “cause” had been identified but initially didn’t publicly spell out the exact details [3] – though later reporting pinned the trigger on that maintenance work [13].