Anyone involved in this would have, should have, access to the safety management system. The accreditation and safety manager of said group would agree to each vehicle operating under their accreditation.
Let's talk about railway Safety Management Systems. They consist of documents, which describe what will be done in order to ensure the safe operation of a railway. That is all well and good in theory, but there is one major flaw... the documents themselves do nothing, except state what will be done.
So it is possible, perhaps even likely, to have wonderful SMS documentation, and to also have an unsafe railway operation, because what is specified in the documentation is not actually implemented.
Which brings us to compliance. Large organisations have their own compliance checks and balances. For small organisations like GMR, it would appear to me that ONRSR is not doing any compliance checks. They are just assuming that the organisation will comply with their own SMS. That could be a dangerous assumption.
GMR is intending to have a "Section Car Rally" in October, and below are two photos of a part of the track they will be running over. There is no SMS which could allow operation over this track, yet GMR are going to do that, and ONRSR is apparently not concerned about it.