Not only, Howrah - Nagpur, after a series of disasters after the year 1990's. the board conducted a survey across the nation to get exact speed limit depending on topography, track sections, stocks etc.
The max limit for an ICF Express/Mail was restricted to 110 km/h, though an ICF can go higher limit, but under Safety restrictions, the speed was lowered.
The 130 limit zones are the famous Grand Chord and the Nizamuddin - Lalitpur n also in some parts in Western Railway sections.
The...
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rest are under 120 only, which is very fewer in some sections.
The Igatpuri - Nagpur - Bilaspur - Kharagpur - Howrah is 110 limit.
Nagpur - Itarsi - Bhopal n also Nagpur - Ballarshah - Warangal - Secunderabad/Vijaywada via Khammam is under 120 limit.
The rest section in south is 100-110 limit, even the Vijaywada - VSKP - BBS - Kharagpur is under 110 limit.
Half of the nation are below 120 limit, and its strict order to the crew not cross the limit, unless the Authorities/RDSO issues a special order to cross the limit under their observation only.
Apart from these, minor overspeed is seen rarely n not taken into account, coz now a days, most them are getting upgraded to buzzer system.
30 secs n more, if the speed is more than restricted, the brakes will b applied n the crew will have to answer, resulting either suspension for a while, or else direct termination.

Go for a Footplate rather than using some weird apps.
The train is handled by a Grade A pilots, who know much better when to handle the throttle and handle the speed.
And they do accordingly given on the sheet, not all the time depends on the route speed.
Nagpur - Ballarshah is under 120 limit, though RDSO has tested sometime back til...
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130, but not yet cleared, as talked to CR based Veteran Rail fan.

But the gps is accurate it didn't cross 120 kmph or didn't attain 130 before before jhansi
N if its a small stretch Sevagram to ngp. Won't make much difference for rajdhani
Unless for cst howrah duronto igp to ngp is made 120-130 kmph.
I don't think that's possible after Mangala's derailment . CR has always maintained less mps owing to passenger's safety...
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still last 2 years has been unfortunate for CR.