entirely new network with standard gauge lines. So new stations and some new track alignment.
It would be much better if the current indian railway network had used standard gauge!
In nearly all HSR systems around the world, we have through services from old lines to new lines, from new lines to old lines (except for the single-direction system in Japan/SK/Taiwan)
Thus you would see slow trains and fast trains on the same platform....
New lines are organically parts of one integral system....
Maybe, the changeable gauge technique could be useful?
(In Spain's case)
Slow night train and bullet train on the same HSR
Bullet train & slow trains in one old railway station
Loan ammount is 80,000 crore. 800 Billion INR. 2.5 billion USD for 50 years.
15 years Moratorium
@ Interest rate of 0.1%
I don't think Japanese would have deliberately thought of making their brand of HSR unique to out smart their competitors. They are a land scarce nation, therefore, it's justifiable that they developed that kind of gauge for their tracks.
If I understand your larger point that other countries may not fit into the scheme once Japanese HSR technology is adopted by India. I may partially agree with this notion but given these corridors are going to be exclusive catering the purpose of high-speed, different corridors may inculcate different parameters depending on feasibility studies and of course financial viability.
Eventually absorbing this technology and then manufacturing these trains at home is the desire. How that will shape in near future in anyone's guess.
Japanese are very smart....
Check their IQ, average 105+.
In the beginning, Taiwan HSR adopted many european standards...
But then Taiwan HSR bought Japanese bullet trains.
And people found out those trains were incompatible with european signal systems and european tracks....
Ultimately, they had to rebuild many parts of the railway.....
I have lots of literature on these issues, but only in Chinese...
It is very interesting to see how one standard takes over another.....
(just like iPhone vs Android phones)