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Polish train manufacturer Newag proven to use geolocation to lock-up trains at third party service depots
(social.hackerspace.pl)
Nobody listens to him. But he was right all along.
More on this, in Polish: https://zaufanatrzeciastrona.pl/post/o-trzech-takich-co-zhakowali-prawdziwy-pociag-a-nawet-30-pociagow/