I agree it's a bit confusing. Under the previous "administration, the rule of thumb was it wasn't truly a "fallen flag" unless there was no successor. Ultimately, that doesn't hold true: Penn Central was subsumed by Conrail, then CSX. Insert NYC or NH before PC. So let's assume the rule had to do with "bankruptcy". But then, there's a forum for B&O, which to my knowledge wasn't acquired in bankruptcy. And as you mentioned, Burlington Northern. It's not consistent. The Anthracites were brought back by popular demand.
I'm not worried about moderators; I've got a good group of admins who serve as "super moderators" for me
. So if something pops up, we're on it pretty quick.
I'm not going to get to it today, but I'll revisit it.