As a matter of interest man do you have the name of said urban explorer. Because early info I had also suggested it was someone in particular but then they turned up very much alive.
I had the impression it was quite difficult to get in there undetected these days, they normally shut the trains down very quickly but that seems not to have been the case this time...
If the article is correct in that it was near flagstaff that means they either went through the flagstaff DRS or through gall. I know that there are only a few people able to do the DRS these days, so that's unlikely along with the cameras. Gall has reed switches on the doors though and is for the most part similarly inaccesible to most, so there is really a small number of people it could have been - I've yet to see any RIP posts on IG tho so idk.