I don't think it needs to be taken that literal. The train orchestrator can set signals on connected tracks and read out the block statuses without needing to a

I don't think it needs to be taken that literal. The train orchestrator can set signals on connected tracks and read out the block statuses without needing to also be able to reach HN and the wider internet. Local can be the track you're on, not merely driving on sight (but, yes, worst case you'd hope there's still procedures for that, too)