I hadn't wanted to come into this, but that's the fact that NR provides it's locos to a large amout of trains which don't belong to it. And we have to accept this.
More over, not only NCR is the zone to prioritize the Rajdhanis, other zones also do the same. This was too no better then unsound statement you gave. All other zones also co-op. Yes ncr has 130k lines, so it has to maintain speed bcoz trains are lined up, if it doesn't do, everything migt get baffled. It's nothing like only NCR do this prioritizing to Rajdhanis.
Plz...
more... you too give some justified statements.
Railways is centrally organized. So everyone one has to co-op.