Bhai fact is fact look at the running of fastest train in Digha Bridge.. 15201 Pataliputra Raxaul IC Exp PPTA 16.55 HJP 1800 effective 20 km in 1 hr..from Aug 1 onwards many NFR trains too diverted via this line,same will be the speed of North East,PSK,LTT KYQ,Seemanchal etc ,only exception will be Rajdhani with just a marginal inc & significant diff you'll see b/w BJU HJP where Rajdhani will cover in 75-80 mts whereas others will take 3-4 hrs.