If this weren’t Deutsche Bahn, I’d say it’s a cyber attack. Given that this is Deutsche Bahn, though, it may just as well be a maintenance issue.
For DB, this type of outage is referred to as "Tuesday".
For context, in case people are less familiar with German politics:
DB is in a misbegotten state of privatization, started in the 90ies. The government spun it out into a private company but still owns 100% of it. They were trying to pump it up so they could sell it for good money. They did that by skimping on everything including maintenance, to try and make the numbers look good.
Except they never got to whatever magic numbers they wanted before the maintenance debt came rearing its ugly head and now everything is royally screwed. And because it's a private company, there's a whole bunch of barriers limiting how much they can even subsidize the thing at this point.
Not sure if this is better or worse than the UK's Network Rail story, but at the end of the day the only thing that will solve this is if they re-nationalize the tracks & infrastructure. What kind of an idiot thought including that in the privatization is a good idea is beyond me. It's not like you can build a 2nd railway network in order to get free market & competition. (For comparison, imagine privatizing the entire road network, village street to Autobahn.)
What is surprising is that GSM-R is 2g. Does not 2g have many security issues?
Same thing happened in Poland and it was confirmed that Russians did it.
These are effective targets for hybrid warfare for that very reason, plausible deniability
Could also be a russian firembomber gig worker getting brushed under mnt carpet of societal stability. Anything to keep this powderkeg of parallel societies going ..
and/or incompetence
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It's russian hybrid warfare against Germany. Since invasion of Ukraine there have been numerous cable cuttings on train tracks, several train derailments, some fires.
It has become so bad that police helicopters are regularly patrolling train routes at night to spot sabotage as early as possible. People complain about the flight noise at night which was not there before.
So as a person working in cyber security, I'd put this into the sabotage bucket.
That's what happens when you ignore critical infrastructure for three decades.
Of course, if the government were to correct the mistakes of the past, it would get worse for another decade. The necessary repairs would cause a lot more delays, and voters would then say "Were giving them so much extra money, and it gets worse? Unacceptable!". So I fear we'll continue to have these problems forever.