Vaishali Express - जितना सुंदर तुम्हारा नाम उतनी सुंदर तुम्हारी चाल - be my valentine - Rahul Vatsa

It is unnecessary, Sir. Tap changer technology in the P1/P4 locos has reached the end of line a long time ago. There is no active development of this technology anymore and the world has moved on to 3 phase locomotives. 3 Phase locomotives are the next step and there is no use of investing a lot of money to manufacture all the Tap changer locos again. The money is better invested in resolving the technical issues with the 3 phasers and upgrading the existing fleet of tap changers.
With the kind of speeds we have in the country now, there is nothing like a shed 'needing' WAP7 or WAP5. Only NR/NCR and probably WR have some claim...
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to 'needing' WAP5's due to them having high speed routes. Locomotive usage in the country is still driven by Loco availability and not the loco's features. So, it doesn't matter which shed gets a P7 and which doesn't. It matters a bit for the P5, but considering that no other zones have high speed sections, here too, the allotment does not matter much.