A group of hackers has discovered that the rail vehicle manufacturer Newag intentionally caused train malfunctions to secure contracts for their repair. According to Rzeczpospolita, this information comes from a group of hackers known as Dragon Sector, hired by railway companies in Poland and specializing in IT security on an international scale.
So unknown in fact, that they posted a picture of themselves on Mastodon and are doing a public talk later this month at the biggest German hacker conference: https://social.hackerspace.pl/@q3k/111528162462505087