As We will see Frequency Change in this 20504 Dibrugarh Rajdhani our ex 12236 Dibrugarh Rajdhani we will see some Speed Up also like
Current
From New Delhi (09:25) to Dibrugarh (05:15)
Travel Time: 43h 50m
24...
more... halts
Distance: 2453 km
Avg Speed: 56 km/hr
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After Changes
From New Delhi (11:25) to Dibrugarh (05:30)
Time: 41h 35m
24 halts
Distance: 2453 km
Avg Speed: 59.32 km/hr
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Decrease in travel time by 2h 15 Mins
Only Increase of 3 Kmph
As per my Calculations