6,800 miles of fast track

china high speed rail 1

In the six years since China opened its first high-speed rail line, the country's network has grown to 6,800 miles of dedicated track -- making it by far the world's largest system.

The scale of the project is simply massive, but it has also produced hundreds of billions of dollars in debt, a deadly accident and allegations of corruption.

First published January 29, 2015: 5:06 PM ET

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