Reverse Engineering (Decompiling) software that you own to fix errors and allow interoperability is explicitly allowed.
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.
That's bonkers. And criminal.
Neither cares about breaking DRM or IP, but third party (including vendor) manipulation.
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.
I fear that (allowing for the "someone with enough money and lawyers can make your life hell" effect) you are not.