not possible bro. My uncle is a LP bro and he does regularly DHN-DDU. I saw Piyush Chowrasia's video of Poorva doing 140 Kmph in ER he laughed and said that it was GPS error.
All Rajdhanis and Shatabdis are mostly run with 3 phaser locos like WAP7 AND WAP5 bro and their is a real time monitoring system that records all datas and stores inside the Loco and icms system.
It is monitored and while occasional speed spike is possible sustained overspeeding is seriously not possible. The Loco pilot will be immediately...
more... suspended if the loco pilot regularly exceeds the route plan that every LP is given when crew change occurs.
In WAP4 loco no monitoring system is present so sometimes overspeeding is done.
Also WAP7s have such acclerrtions when compared to WAP4 making up tt is much possible easy.