Sadly they are. They dont need to know what is CBC and Screw coupling. They just need to reach their destinations comfortably. The jerks are really annoying and make the journey a nightmare. Many complaints have come regarding this. Thats why IR has come up with a modified version of CBC coupling to decrease the effect of the jerks. Just imagine yourself in a journey full of jerks.. Main thing people look is by no doubt, comfort, then safety comes along.