I don't think that you are reading that like a lawyer would.

For example article 6, part 2 (a) does not allow the information retrieved to be used for any purpose other than establishing interoperability. The hackers stepped over that line when they released some of what they discovered for the purpose of publicly criticizing the manufacturer.

There's ECH ruling that fixing errors is legit case of interoperability.

I hope that you are correct.

I fear that (allowing for the "someone with enough money and lawyers can make your life hell" effect) you are not.

I think this should be filled under sabotage of critical infrastructure.

It is either that or DRM means the OEM gets to remotely shut down entire train network whenever they like? Imagine the money one could make with such a service.

From what I gathered in Polish media, the Dragon Sector's attorney has implied they are eyeing exploring this possibility legally.

yeah screw this. if they are claiming that they hacked their DRM they should absolutely counter sue that this DRM counts as sabotage and/or domestic terrorism. There was literally code in there that told the trains to stop working after X date if it sat still for X amount of time.

That's bonkers. And criminal.

Prosecution started working from statues that talk about crimes of preventing someone from operating, as well as manipulation or prevention of proper handling of data relevant to national security and/or transportation.

Neither cares about breaking DRM or IP, but third party (including vendor) manipulation.

Yes, imagine if a individual did this and not a company. A individual would probably go to jail.