It may be due to non availability of facilities at SSB and DSJ that the trains bypassing DLI, NDLS, NZM are not getting passengers from DSJ.
I have analysed pattern of bookings for 14624 FZR CWA Express from DELHI which shows current availability in its all classes for DLI JHS section. While in same time slot 18428 or 12715 gets full at NZM.
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Railway either to make more facilities and trains at DSJ or make Patalkot via NDLS.