Reply 1: 21/22 Southern AC Express started to connect NDLS-BZA whose link already posted
click herePic 2 In reply 1 says: Stations between: HYB-NDLS 331/221 & 22/48, Class of Accommodation: 1 Coach I+III & 1 Coach III: Path-Southern Express Days.
5 Days service from 1 Oct 1964
click here 1 April 1964 Ordinary Southern introduced
click here HYB Part was Slip for 21/22 Southern Exp which become Main part of 21/22 Dakshin Exp with new Slip from VSKP!! So inauguration taken for maiden run of 21/22 Southern aka Dakshin Exp!!