Not big window .Additional 2 windows in the 3+ 3 berth bay and 1 window at the side upper berth of siges 6 inch ( 15 cm height and width of the present window ) .The existing window height have to be reduced by 4 to 6 inches and provide 6 inch height and present window width at appropriate height so as Middle berth and upper Berthed passenger views outside.
These windows provisions are possible only in the AC coaches.Sleeper class coaches Shutters are occufied these places.