If you get a waiting ticket then you should use an option consider for auto upgradation.By this way you get an upper class to travel without extra charge
please wait...Translate to HindiAgar aapko waiting ticket milta hai toh aapko auto upgradation ki suvidha ka vikalp upyog karna chahiye. Is tarah se aap bina koi extra charge ke upper class mein safar kar sakte hain.