The train deceleration starts when it's 3km away from station from 100 kmph to 60 kmph when the engine hits PF and halts it takes 3min. Ac eralrion of train from 0 to 110 kmph will take 5mins and 5 km is covered. So total 8km deceleration and acceleration takes 8mins if the trains runs without stoppage then it will cover 8km in 5 mins with avg of 96kmph. So net savings is 3 mins when the train stops in mainline. If it take looping to PF then it has come to 15/30kmph at change over points the travel time increases and net savings will be 5 mins. VB also stops in 4 stoppages so remaining 14×5 70min considering all 14 stops are looped. 11 45 - 45 for storage time 1100 the acceleration deceleration -75 gives 9hr 45mins with 4 stops for normal train with 110kmph ....
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VB now takes 8.5hrs and is 15mins early to nellore and another 15 to SC so let's consider 8.15 hrs still VB is faster by 90 mins because of higher acceleration 0 to 100kmph in 60 sec and 130kmph for some stretch. If 130kmph clearance is given to LHB trains in TT max another 30 mins will be saved for GDR Tenali and will cover in 9 15 hrs.