Actually it is not possible to replace all coaches with LHB ones since they have a significant drawback - they are not self power-generating and a train with LHB only coaches like Shatabdi Express has two generator cars, one at each ends to generate power - which in turn increases cost and reduces revenue/passengers and thus is not possible in many trains like the local trains.
LHB Coaches are being modified for the same purpose - ICF manufactured LHB Coaches have been upgraded from their original German versions - Shatabdi's LHB coaches were modified as ICF devised permanent magnet alternators since the dimensions of LHB coach did not let power generators attached to the wheels - It is in prototype phase but might be used for Shatabdi only -
Self-generation mechanism to power Shatabdi coaches - The Times of India
Even if we have to replace all possible coaches with LHB ones - it will probably take more than a decade - the old ICF coaches will be in production at least till 2020. On the other hand the production of LHB coaches is increasing but not a pace to replace all possible coaches with LHB ones in the near future and neither is their plan to do so - Integral Coach Factory produced a record number of 1,704 coaches during the last fiscal including 239 DEMU coaches, 300 air-conditioned coaches and only 65 LHB coaches.
ICF would manufacture 285 LHB coaches in financial year 2015-16 and 600 such coaches in FY 2016-17.
ICF to manufacture 975 LHB coaches in three years - The Times of India
@anant_s Any idea of the total locos and coaches produced every year - and their breakdown in LHB / ICF etc.?
We'r already exporting to Africa - These coaches were exported to Senegal -
Indian Railways exports these beautiful coaches!
Like Pakistan turned into a Chinese vassal when it exported coaches to Pakistan?
BTW it's 'vassal' not "vessel'.