12723 Telangana(AP) Superfast Express is a NDLS bound train and 12649 Karnataka Sampark Kranthi is a NZM bound train ........ still many times 12649 overtakes 12723 before Ballabgarh & Mathura
12649 KSK(towards NZM) also overtakes 12627 Karnataka Superfast Express(towards NDLS) before Mathura & Agra
Platform occupied by Telangana and Karnataka at NZM is mostly PF 2
KSK mostly occupies PF 6/7