For decades, the rule of high-speed rail seemed unbreakable. It belonged to small, rich, densely-packed nations with patient engineering cultures. Continental giants were too big, too spread out, too expensive. Geography always won. Then China built the largest, fastest, most advanced network the world has ever seen - and built most of it knowing it would never turn a profit.

On paper, it looks like a catastrophe. Hundreds of billions in debt, stations stranded in empty fields, four-fifths of the network losing money, and some of China’s own experts now whispering an alarming word about what they’ve built. What looks like the most expensive mistake in modern infrastructure may actually be one of the most deliberate bets any country has ever made.

I rode it for six hours, from Hong Kong deep into the mountains of Hunan, in a lie-flat suite that shamed every train I’ve ever taken - and most business class cabins too. This is the story of why a country would lose money on purpose, on this scale, and why every transport ministry on Earth is watching with a mix of envy and genuine fear.