There are certain stoppages, which are provided for trains approaching the destination ,but not when train originates. It is done due to operational reasons. For south bound trains originating from New Delhi, there is no stoppage at Nizamudin but same trains stop at NZM when approaching NDLS. Similarly for north bound trains, when approaching NDLS, many trains have stoppage at Sabzi Mandi Station, but when same trains depart from New Delhi, there is no stoppage at Sabzi Mandi.