"IT Outage: No train service nationwide. Due to a nationwide outage of the GSMR digital rail radio system, all trains are being held at stations. We are working around the clock to resolve the issue.

Our technicians are working around the clock to resolve the outage.

Please continue to check your travel connection immediately before departure using the travel information service at bahn.de, the DB Navigator app, or by calling the travel information hotline at 030/2970."

https://www.bahn.de/service/fahrplaene/aktuell