When China recently reclaimed the title of having the world's fastest train, it might have been a moment of national celebration. Instead, there were worries about whether the cost was worth it.

The "Fuxing" (rejuvenation) high-speed train service between Beijing and Shanghai returned to operating at 350 kph on Sept. 21. For six years, it had been limited to 300kph following a crash in 2011 when two high-speed trains collided, killing 40 people and injuring about 200.

China Railway Group -- the state-owed company that operates high-speed trains -- now groans with over $700 billion in debt.Speculation is rife that fares must rise to service the debt. Speculation is rife that fares must rise to service the debt. But there has been no fare increase for the Beijing-Shanghai route yet.

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