Hmm . Well. Saari Shatabdis ka yahi haal. hai. Shatabdi's from NR are always sent with mixed coaches comprising old and the new ones.Earlier , when it used to run from ANVT, it used to be an exclusive train beacuse it was the only one from ANVT. Now it starts from NDLS, and you have nearly a half a dozen Shatabdis originating from NDLS.
If that Logic is put into action, then why Various shatabdi's including this one Got coaches manufactured for Gaatimaan Express. It has been spotted with one or two coaches of Gaatimaan express which sport Radium strips that are exclusive to that train.