Raj & DRNTO do have CBC coupling & still they arnt 24 coacher!! In speaking one train (or Loco), u induce example of diff type coached rake, while P-4 is quite acquainted to pull that load easily but even P-7 cant safeguard coupler breakage!!
PS: Raj was running earlier, in same mentioned section, with same kinda P-4 without banked!!Shatabdi in between CDG-Kalka gets banked even when they do have p-7 pulling them!! Kalka Mail 13-15 Coach rake gets banked while P-7 pulls!!