BBS rajdhani halts here because after Cuttack, its the biggest city before West Bengal and a great money earner for ECoR.
Rajdhani is halting here from its 1st run itself.
Sangrami is a SR train , so SER can't interfere for halts.
But still its a huge secret why only Sangrami and HWH SSPN doesn't halt here, whereas rest every non-duranto train halts here.