Yes, but new I don't think so. The experience that I have with bju g, it can be easily extended to itr, itna packed nahin chalti wo. Baaki of course uska tt revise karna padega all from bju.
Ir slip concept hata raha warna I guess a few slip coaches from sdl attaching with shivnath at bsp could've been the most apt arrangement.
Waise abkp durg ka extension itr possible hai kya?