The reason for red is quite obvious...if u are running a train from rxl to delhi then how can you make it run via pnbe...make it run via nke-gkp-lko-cnb
To aap intercity chalao na pnbe tak...ek delhi jaane wali train ko kyun le ja rahe ho ...is se accha to ye kariye aap is train ko via Howrah le kar jaiye delhi tk...howharh connectivity bhi mil jayegi.. ;-)
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