Your train is taking only 40 mins in R-BSP stretch. Which is impossible in that stretch. Distance is almost 120 km. It'll take at least 1:30 hr. Even Rajdhani, Gitanjali and some more trains travel in 1:30 hr with avg speed of 73 in this section. One more thing can be done. You can make the time table with 2 nights and 1 day. That will make the journey more comfortable.