in mid of january 2012 I was comming from Bangalore (Took sbc-ghy express)... When the train was leaving hwh(sbc-ghy express) i saw the empty rakes of coalfield express. It was going to coaching complex. on the board it was written "Coalfield express/Shantiniketan Express/Agnivina Express".... but the elctronic board was showing "13011 Intercity Express". that means when the coalfield goes to coaching complex, the IR authority makes it 13011....... and next day when 13012 comes, IR makes it 53047.....