It may matter bcoz mamy trains including purushottam exp,shm gorakhpur ,src anvt exp ,tata amritsar follow this route.if it is doubled.train control wil become easier .also for rajdhani to stop at prr n follow route to gomoh via bokaro this needs to be doubled.also i wrote the same in pgportal.gov.in asking for the doubling of this.the reply was along with the prr ksx route the prr bksc bypass line will also be doubled