Its a common sence
Its a common sense, project like this can not be on Ground, railway crossings, cattles , road traffic is huge issue in India should not a reason for train to get late and that too in such a high speed. I don,t have google to answer your question. Its a simple logic. + making easy target for evil forces to attack but why are you getting stressing yourself on this ?
Its a common sense, project like this can not be on Ground
Because common sense is not all that common now a days:
Country like France runs its TGV through its plains covering large part of countryside on non elevated tracks. And you think there are no cows or animals there?
So does japan and other countries who run these HST on fortified tracks on the ground.
Here is Eurostar from UK/France:
It is not mandatory to run a HST only on elevated tracks.
And many countries run them on ground level.
Now please do not come back and tell me they don't have a single straying animal, which can cause the disaster.
Sorry to burst your bubble.