These coaches may run at speeds of 130 kmph.. The vibration, however.. would be intense. There would be no comfort. Take an example of the coaches of VSKP Swarnjayanti express. I've traveled in the AC II tier from VSKP-AGC. The coaches are really old and they would start vibrating as soon as the train reached speeds of around 100 kmph. A duronto with an average speed of 72-74 and a 15-20 minute halt at BZA will have to run at over 100 kmph for most of the time. This would mean vibration all throughout the journey. And because its a CBC rake, the jerks are too common.