The sabotage of more than 20 trains in Poland by apparent supporters of Russia was carried out with a simple “radio-stop” command anyone could broadcast with $30 in equipment.
. But the mysterious saboteurs who have, over the last two days, disrupted Poland's railway system—a major piece of transit infrastructure for NATO's support of Ukraine—appear to have used a far less impressive form of technical mischief: Spoof a simple radio command to the trains that triggers their emergency stop function.
Poland's railway system, after all, has served as a key source of Western weapons and other aid flowing into Ukraine as NATO attempts to bolster the country's defense against Russia's invasion. “We know that for some months there have been attempts to destabilize the Polish state,” Stanislaw Zaryn, a senior security official, told the Polish Press Agency. “For the moment, we are ruling nothing out.
“It is three tonal messages sent consecutively. Once the radio equipment receives it, the locomotive goes to a halt,” Olejnik says, pointing to a document outlining trains' different technical standards in the European Union thatused in the Polish system. In fact, Olejnik says that the ability to send the command has been described in Polish radio and train forums and on YouTube for years. “Everybody could do this. Even teenagers trolling. The frequencies are known. The tones are known.
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