A non-stop train has slack at some instances... While a train taking stoppage at multiple stations enroute persist an aggressive TT. Ljn-Gkp has a very nice TT when compared to bsk,sk but it halts enroute at many stations.. But this didn't justifies that bsk and sk should halt at stations enroute. Standing at outer for 30 mins maybe called as platform issue at station but this doesn't means that a particular train must be stopped at intermediate stations. Don't get confused between slack and aggressive TT. A non-stop train is given slack to avoid much delay or to cover the delay.. But aggressive TT trains don't have such facility.. Once they get late.. They get late further...