Here it is again.
PQ is end-to-end quota used to retrict some intermediate station passengers to only this quota and not allowing them to get alloted from the end-to-end GN quota. But for end to end passengers, apart from GN quota, even PQ is used to allot berths.
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Hence PQ is a quota to "benefit" end to end passengers, but "restricting" the intermediate...
more... passengers to only PQ. Clearly, it is NOT for benefit of intermediate passengers, it is infact harsh on them, that they dont have access to a big quota.