... Similar way - bullet trains connectity should be common way to travel after 10-20 years in india
Uh. You won't see this situation in your lifetime.
If India can master some high-speed rail manufacturing technology and independently manufacture some high-speed rail facilities and equipment within 10-20 years, then that is entirely possible.
But for high-speed rail to become a common mode of transportation for ordinary Indians within 10-20 years, there is absolutely no possibility of that happening. ------ Your country's political system would absolutely not allow something like this to happen.
Chinese HSR projects are loss making and are under huge debt, such projects needs economic viability, they are costly.
China's high-speed rail projects are indeed operating at a loss. That's a fact. Many state-owned public service systems in China are operating at a loss.
For example:
China Post's express delivery and mail services have never been profitable; they are operating at a huge loss. China Post relies on its banking business to offset these losses.
Many lines in China's urban public transportation systems have been operating at a loss for a long time. However, laws prohibit them from shutting down these consistently unprofitable lines.
Many public service systems in China that serve ordinary citizens are subject to government regulations that force them to operate at extremely low prices and prohibit price increases. Furthermore, the law does not allow them to shut down; they must continue operating indefinitely. (The companies operating these projects are all state-owned enterprises.)
As for the underlying logic behind this, I don't think you can understand it.
=================================================
I just checked the relevant data, and the profitability of China's high-speed rail has changed.
Financial reports of China National Railway Group in recent years:
2020: Net loss of 55.5 billion RMB
2021: Net loss of 50.7 billion RMB
2022: Net loss of 69.6 billion RMB
2023: Net profit of 3.3 billion RMB
2024: Net profit of 3.9 billion RMB
First three quarters of 2025: Net profit of 11.72 billion RMB