It has been running from ages with the same timngs and lot of stoppages will not be possible to speed up even the fastest train dadar exp takes 23hrs. Instead a new train 2-4 days a week should be I yroducedftom Bangalore and chennai to Mumbai with 18-20hrs running time. As doubling is in full phase now expected 90% yi be completed in next 2 yrs Super fast trains with less journey will be feasible.