Deutsche Bahn later said the disruption had been fixed after trains were at a complete standstill for more than two-and-a-half hours. BBC reported.
"Our IT experts worked tirelessly to resolve the issue – successfully. The disruption was quickly fixed, and service is now gradually resuming," it said. "We thank all passengers for their patience," it added.
At 22:30 local time (21:30 BST), Deutsche Bahn said a nationwide disruption of the Global System for Mobile Communication for Railways (GSM-R) meant that all trains were being held at stations.
In a followup statement, Deutsche Bahn then said the cause of the disruption, which had affected internal communication channels, "has now been identified" and technicians were working "diligently to resolve the issue".
