Dear
Railway only foucused on Main Line like - Howrah-NDLS,NDLS - Mumbai, Mumbai-BLR etc but remaining part will not facilitate with that we can travel with everage speed of Exp (35KMPH), SF (50-56 KMPH) & Passenger (Less than 35 KMPH).
That is the reason IR would not utilise their resouces for plying more trains.