Could have started early morning from BSP reach Tata in the afternoon and return back to BSP by night, make it seating, hopefully in that case there is no need to run ROU-CKP-ROU spl and CKP-Tata-CKP spl. Timing also matters..
There can be a MEMU starting ROU early morning towards Tata as stated once by CKP Sr. DCM.