Agree, same routes pe chalne wali existing trains se fast honi chaahie VB tab jaake IR 50-60% extra fare justify kr paaega, warna Humsafar jesi haalat hogi ki fare to jada le rhe h lekin speed normal train jesi h, to koi fokat me paise kyo kharch krega, wese bhi normal trains se SL kam krke AC badha rhe h to log usme jana jada pasand krenge. Mere hisab se unless route constraints na ho to VB ki avg speed 85kmph (minimum) honi chaahie. Isse faster service pe hi dhyaan dena chaahie railway ko warna Gati Shakti or Mission Raftaar bas titles reh jaaenge.