“Time formatting error” caused rail delays in Poland

Some services delayed by up to 8 hours: https://www.facebook.com/Opoznionypociag/posts/1868989756625...

This article suggests an outage of an Alstom-operated NTP server to which 19 (out of 33) local traffic controlling centres across Poland were connected: https://niebezpiecznik.pl/post/cyberatak-na-pkp-ktorego-nie-...