In one of the most popular presentations at 37C3, the three hackers uncovered something monstrous: Newag trains went into hibernation using a sophisticated game of hide-and-seek if they were parked for too long within the geocoordinates of competitors‘ or customers’ workshops or were left in conditions that indicated they underwent an unregistered repair. Only by calling in a Newag technician could such deactivated trains be ‘rescued’. All of this was uncovered without the potentially illegal replacement of train components which would require certifications.
What.
Streisand Effect in 3, 2, 1…
https://badcyber.com/dieselgate-but-for-trains-some-heavyweight-hardware-hacking/
to complement the list of ressources, this was a very fun (and layman-level) read