Between MGS and Delhi
12801 Purushottam enjoys >> priority than 14055 Brahmaputra Mail
If 12801 Purushottam leaves ALD jn 5-45mins before Poorva/Shiv Ganga ..good chances that it will get reach NDLS before these two but 14055 Brahmaputra will be always taken by Shiv Ganga before GZB even though it goes to DLI and has no issue of sharing platforms in NDLS