Train manufacturer intentionally bricks trains serviced by independent service providers (social.hackerspace.pl)
Polish article...
Polish Trains were equipped with automatic killswitch by manufacturer Newag (social.hackerspace.pl)
A polish hacker found out why trains did stop working. The manufacterer implemented a hidden electronic switch, which automatically activated after trains were serviced by a different company.
Train manufacturer intentionally bricks trains serviced by independent service providers (social.hackerspace.pl)
Polish train manufacturer that lost servicing tender programmed train controller to brick itself after train stays for some time in 6 ISP facilities or in 1 their faculity(for testing?) until undocumented button combination is pressed. Some controller versions brick itself after train is idle for 10 days. After news about this...
Polish train manufacturer Newag proven to use geolocation to lock-up trains at third party service depots (social.hackerspace.pl) Polish
A Mastodon thread by @q3k, who, together with @redford and @mrtick have reverse engineered the PLC code of NEWAG Impuls EMUs