Yes their is very much in need for SF train on this route so that journey could be enough fast and ppl reach from one to other city soon. Exp trains are lot. But Amravati Exp is unofficial SF of BAY GDG route. I used TT of Amravati Exp so avg speed was 59kmph so I reduced again using Hari Priya EXP TT and some changes finally made it 15.30 hours of journey to Mumbai cst