You need to check my comment again
I clearly said, half of the AC coaches of 12367 gets filled between Kiul & Pnbe and so on.
Yes it's quite obvious that you need to book in advance in order to travel till ANVT.
And I already told you that there is a flaw in all the rules. And also TTEs alloted to these trains...
more... till PNBE of ER aren't quite proactive, even ER doesn't provide RPFs in this route.
Still if a railway employee is entitled to travel in 1st class to their HQ with passes being issued, they can travel in AC coaches.