A few points :-
1. Simple method - first equip this loco with ultrasonic doppler radar (like EMDs) and configure the software accordingly so that the speed of the motion of the loco can be taken as a reference for comparison with the speed of each axle.
The point is, it can apply more torque on the rails owing to its high gear ratio (67:35:17) but the adhesion controller limits its starting TE. In radar based adhesion control, its adhesion can be maximized, which will automatically maximize the TE for its weight....
more... Its current TE is nowhere close to the maximum it can exert!
And besides, if the axle load is increased, it cannot be done without increasing its overall weight. Reason -
WAP5's overall weight = 78.0t (+/- 1%)
Axle load = Overall weight/No of driving axles= 78/4 = 19.5t
If its axle load is increased up to, say 21t, then the overall weight = 21x4 = 84t.
2. Field oriented control for induction motors to make sure the slip detection can take place in a matter of milliseconds :)
3. IGBT traction to control every axle separately and more effectively.
4. WAP5 with IGBT based composite converter will have an IGBT based Hotel Load converter as well, which means the HOG facility will be available. CLW is finalizing the specifications for the same.
5. It's already wide enough. Width of WAP7 = 3.152 metres. Width of WAP5 = 3.142 metres. There isn't any big difference as such.
6. More HP output is required.
7. Above all - INCREASE the PRODUCTION.
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BTW, check out this cool video of a crazy ride in WAP5 (Amul) 30048 hauled Superfast express.