No problems. I too learnt that Duranto has 5 coaches of AC 3 Economy and then one extra coach too. Have these coaches been there since inception of the Duranto on this route? I checked the Duranto fares.. There is a 10% reduction in the AC Economy as compared to AC 3. I was trying to understand the WL for AC Economy. The inside berths have almost the same comfort as AC 3 and you can travel for 10% less. interesting?