That route requires massive investment, first it will need a new rail flyover at Hathras Jn to connect NDLS-TDL line to connect to Kasganj line, after that in Farrukhabad, where the ganga river is narrowest, there's a army cantonment area, so it can't go through there. Also it will require two massive bridges to cross Ganga and Ramganga and their flood plains and after that another rail flyover at Bangarmau, plus I don't think it's going to save any time, although if this is build it will be beneficial for sure.