From 1999 to present, China has managed to build by far, the largest high speed rail network on the planet. Since high-speed rail service in China was introduced on April 18, 2007, daily ridership has grown from 237,000 in 2007 to 2.49 million in 2014, making the Chinese HSR network the most heavily used in the world. Cumulative ridership had reached 2.9 billion by October 2014.[Wikipedia]
The full history of this tremendous network can be found on this site. China has the world’s longest HSR network with over 19,000 km (12,000 mi) of track in service as of January 2016, which is more than the rest of the world’s high-speed rail tracks combined, and a network length of 30,000 km (19,000 mi) is planned for 2020. The China Star (DJJ2) train set a local speed record of 321 km/h (199 mph).