Arnab Bhai it's not a permanently swr train...since the rake was being transferred from Bangalore hence the planning n all duties was given to swr....it is swr train only till it reaches Dhanbad I think.... similarly if you remember jammu-hwh ac special with sdah hs rake....it was given to nr....once it reached hwh n sent to rnc as ac special it was given to ser an after it returned back to hwh and was being sent back to jat it was an ER train