Same happened with me plenty of times once while traveling in CBE JP Exp Almost Did MAS GDR in 2hours but slowed near gdr and 20min delay is added this happens near bza ndd as well experienced with Circar Vikramasimhapuri ICE done BZA GDR in 3h53min or so once I with 7 stops so i thought 4 hour bza Gdr is possible for stop heavy trains and 3h30 min for limited stop trains for me 10 min Speed up is possible for every 100KM once the route is upgraded to 130 KMPH bza Gdr is 293 KM so 30 min Speedup is possible and 35 min is possible between BZA vskp,bza sc routes