This is the best summary I could come up with:

The code also allegedly bricked the train if “certain components had been replaced without a manufacturer-approved serial number,” 404 Media reported.

In a statement, Newag denied developing any so-called “workshop-detection” software that caused “intentional failures” and threatened to sue Dragon Sector for slander and for violating hacking laws.

“We also notified the Office of Rail Transport about this so that it could decide to withdraw from service the sets subjected to the activities of unknown hackers.”

Newag president Zbigniew Konieczek said that "no evidence was provided that our company intentionally installed the faulty software.

So far, Dragon Sector does not appear intimidated, posting its success on YouTube and discussing its findings at Poland’s Oh My H@ck conference in Warsaw.

The group is also planning “a more detailed presentation” for the 37th Chaos Communication Congress in Hamburg, Germany, at the end of December, The Register reported.

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