train started as ganga kaveri express superfast from chennai to varanasi in 1970's. then it was slowed down and the name ganga kaveri express was removed and it was called madras varanasi express with change in terminus from beach to central therfore delinking chennai rameswaram MG connection. now that 4259/4260 rmm bsb express is back it should be renamed ganga kaveri express and chennai varanasi express should have been extended to patna instead of chappra and made daily with new name sanghamitra express.