I haven't read of such controls, nor of a 'transit zone' there, and I haven't seen any refugees there when I boarded a train there two weeks ago. I suspect the reason is that few refugees arriving from the south or east realised that they can change trains there and got off only at the thre terminal stations (there are refugee 'transit zones' at the Budapest Nyugati and Déli, too).

_{*Lunatic*, n.
One whose delusions are out of fashion.}