Dear Arnab,
Reference:/blog/post/1575758
As per the Communication made by CLW through it's "Bi Monthly Corporate Communication Newsletter" CLW most probably stop the WAP-4 production within the Next Month or latest by Dec this year as because if you see the Tenders of CLW Website(Active CPP Tenders) you won't find any Conventional Loco related tender now. All are 3-Phase Tenders, moreover now they float tenders regarding the upgradation of the Civil Engineering Assests of Loco Production unit, it's sure that these Civil Engineering Assests upgradation is exclusively meant for 100% switchover to 3-Phasers....
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Already they have stopped WAG-7 production(Last WAG-7 shell turned out from CLW in August 2015 which you find in the Photo Gallery of CLW's Official Website).
So upgradation is going at War footing manner for the 100% switchover to 3-Phasers in CLW and the Transition will likely occur either in Nov or in Dec 2015 which is inevitable.
Secondly, South Eastern won't be a hindrance for CLW as because it is depending on the Zone what it will do if SER is comfortable with WAP-4 then they can use WAP-4 only no harm in it. It's the mindset.
On the other hand, see southern Zone Royapuram is decorated with more and more WAP-7 and in future it will be a WAP-7 shed mainly by trasferring all it's WAP-4s to other zones. It's mindset dear, Southern has a positive mindset towards the 3-Phase Technology whereas SER has a stubborn and orthodox mindset for the reason best known to them. This is the Zonal issue and not likely to hamper 3-Phase production by CLW which is an independent body controlled by the Railway Board of India.

It means after the Loco 25051(92 nd P4) will turn out CLW will stop it's production of WAP-4 right????
click here
We can expect latest by Nov or Dec 2015 for 3-Phase Transition.(Please confirm the Time as because if you see the GM's statement in screenshot of /blog/post/1575758 and narration of this blog you can see that he has already said "From Oct 2015 onwards we will turn out only 3-Phase Loco you can cross check the BLOG to verify this statement of Mr C.P Tayal GM of CLW)
So,...
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from this month CLW should stop it's conventional Loco Production as per the above BLOG.
But if it's extended more then the "Role of the GM of CLW" will be in big question and the Future of 3-Phasers will be at "THE BOTTOM OF THE AGEAN SEA FOR INFINITE TIME IN THE FUTURE----- INJUSTICE WILL BE MADE WITH 3-PHASERS ONCE AGAIN AND 3-PHASER WON'T BOUNCE BACK IN FUTURE".
Let's see what CLW will do at last ???
There is "A wide gap between your lips and the Tea Cup"--------- We can't believe unless the Final declaration is made officially as it is ORTHODOX IR.