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Reblogged by isagalaev ("Ivan Sagalaev :flag_wbw:"):
q3k@hackerspace.pl ("q3k :blobcatcoffee:") wrote:
We found that the PLC code actually contained logic that would lock up the train with bogus error codes after some date, or if the train wasn't running for a given time. One version of the controller actually contained GPS coordinates to contain the behaviour to third party workshops.
It was also possible to unlock the trains by pressing a key combination in the cabin controls. None of this was documented.
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