Sir, we are not talking about Window curtains but aisle curtains in each coupes ... window curtains are provided in all Air Conditioned coaches of all trains but not aisle curtains ... maybe the very new 3A ICF/RCF coaches of even normal trains are provided with aisle curtains , am not sure 'bout that. As far as the Rajdhanis are concerned, not all 3A coaches of all Rajdhanis have aisle curtains. Rajdhanis' coaches are of very mixed composition, both old & new, its a matter of sheer luck to get a new 3A coach with aisle curtains in a Rajdhani. It's my personal experience sir. Also not all Rajdhanis still today have LHB coaches (e.g. Ranchi Rajdhani), so having aisle curtains in 3As of Rajdhanis is a matter of speculation & luck :)