While the GSM-R system belongs to the rail system which is dubbed critical infrastructure much of it is either publicly documented and/or shared between a rathe

While the GSM-R system belongs to the rail system which is dubbed critical infrastructure much of it is either publicly documented and/or shared between a rather large number of operators. So far I didn't read anything that would indicate that this disruption required more than somewhat specialized domain knowledge and a bit of experience in the industry.