Let's up for Discussion,
Who thinks Indian Railway should develop broad gauge HSR instead of importing standard gauge and have some trust in Indian sharpest mind and talents even it takes 5 years but what we have will be our own.
It's hard guys, we've achieved 220km/hr in Indigenous developed Train 18 so it's matter of time and money in 5-8 years we...
more... will have a train set say train 47 touching 400, given separate HSR track.
Why broad gauge?
Interoperability - In many countries HSR track are used for freight traffic in night time.
IR can use other premium trains on this like train 18 with their full capabilities on these track in non peak hours or behind an HSR to leverage more margins even if HSR route isn't feasible for now.
Win-win
Reduced infrastructure - no need for new yard, shed, maintenance and station. HSR can also use same infrastructure as other premium trains.
HSR can run on dedicated tracks and when entering their suburban stoppage switch to normal IR tracks(or semi HSR).
Hassle Less travel - It would be easy board deboard all types of train from same station so any passenger taking connecting train from remote location don't need to exit railway station.
Well it's further up for discussion for cities like Delhi and Mumbai it shall be good idea to build seprate track and station to cater heavy traffic will be matter of more reaserch because your last 100km journey takes hr/s because of no dedicated tracks.
Let me clear I don't think HSR is waste of money we should have also these options and I'm in strong advocate to have HSR with the same gauge as normal tracks because everywhere they have same gauge and they ticked all these points I've mentioned.