It was in Poland but in Poland you can still stop trains with radio signal of a specific frequency. No encryption, no validation. Anyone with a hobbyist level radio equipment can stop freight trains. And they do. Train operators usually just call the station, confirm that it’s a prank and 5 minutes later start again.
Poland’s national transportation agency has stated its intention to upgrade Poland’s railway systems by 2025 to use almost exclusively GSM cellular radios, which do have encryption and authentication. But until then, it will continue to use the relatively unprotected VHF 150 MHz system that allows the radio-stop commands to be spoofed.
It was in Poland but in Poland you can still stop trains with radio signal of a specific frequency. No encryption, no validation. Anyone with a hobbyist level radio equipment can stop freight trains. And they do. Train operators usually just call the station, confirm that it’s a prank and 5 minutes later start again.
https://www.wired.com/story/poland-train-radio-stop-attack/
Poland’s national transportation agency has stated its intention to upgrade Poland’s railway systems by 2025 to use almost exclusively GSM cellular radios, which do have encryption and authentication. But until then, it will continue to use the relatively unprotected VHF 150 MHz system that allows the radio-stop commands to be spoofed.