Comments moved to https://news.ycombinator.com/item?id=48651613.

It is the only English source I could find.

Apparently, all train services in Germany are currently disrupted.

German source:

https://www1.wdr.de/nrw/verkehr/zugverkehr-in-nrw-komplett-e...

Not much is known currently, except that the German railway has issues with radio communication - which I found curious enough to post.