it cud be renaming of twice weekly rajdhani or special rajdhani taking some 20.30 hrs !!!! this twicew eek runs on timings of 3 - 4 days duranto ... thus instead making duranto daily ac-express is renaming of bi-weekly rajdhani stopping at bharatpur + 2 station more before kota ., then ratlam., vadodra ., surat ., borivali ...