How much factor does availability of platform, stabling lines, space at pit lines matter while deciding speeding up ? In the context of Udayan , will the early arrival lead to other issues like blocking of platform, non availability of pf, too may trains arriving at peak hours in SBC hence SWR unwilling to prioritise this train and so on !! Its a valid point tha even after doubling, electrification, speed upgrade etc, hardly any difference is there in overall TT