Don't extend Chennai - Delhi garibrath to amritsar, already amritsar is too much rush. instead it can extend either jammu/katra with stoppage at jalandhar helps and serves the amristar people also and jammu people also.
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Because in amritsar if you need to enter really need to wait minimum 1 hr for SF trains in outskirts of amritsar near manawala/jandiala guru. moreover maintenance at amritsar is too poor