7091/92 Secunderabad-Varanasi and 7089/90 Cochin-Varanasi kuda undeevi kada sir...
naaku telisi TPTY-BSB(7491/92) was tri-weekly, later one day extended to Cochin(7489/90 later 7089/90) making TPTY-BSB bi-weekly.
Members, please correct me if I am wrong.