China's new Harmony Express train can reach speeds of 400 km/h.

Within a minute of departure, the world's fastest train travels at 120 miles per hour

In testing, it reached speeds of nearly 250mph (400 kph) and it covers the 660 miles between Wuhan and Guangzhou, the equivalent of a journey from London to Edinburgh and back, in just three hours.

The Harmony Express is just the first step of an epic £480 billion project to build nearly 19,000 miles of new railways in the next five years, 8,000 miles of which will be tracks for high-speed trains.