Originally Posted by
HeliComparator
No that wouldn't be allowed or be reasonable (well, actually you can notam anything you like, doesn't mean it holds water!). You cannot have a chunk of airspace and then say "sorry, we are going for lunch, nobody may use that airspace in the mean time". In other words no point in having an ATZ if no-one is allowed to fly in it! But no doubt some owners of train sets might be upset at the thought!
Pretty certain the owners of Miltary train sets take an extremely dim view with all their ATZs being declared active 24/7. Don't confuse with MATZ, which is during hours of operation.