A single radio system failed and every train in Germany stopped at once (apnews.com)
Deutsche Bahn's GSM-R digital radio failed nationwide, so every train was held at a platform. Stop signals and signalling kept working, which is how they parked the network without a single collision.
A security engineer in the thread put it in the sabotage bucket, citing cable cuts and night helicopter patrols since 2022. Others, knowing DB, bet on a botched software update.
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