Hexie High-speed Rail In Chongqing， China Editorial Photo

China`s high-speed rail HSR is the world`s longest and most widely used high-speed rail network-the total length will reach 40,000 kilometers by the end of 2021. The high-speed rail network includes newly-built railway lines with a design speed of 200-350 km/h 120-220 mph. China`s high-speed rail accounts for two-thirds of the world`s total high-speed rail network. Almost all high-speed rail trains, tracks and services are owned and operated by China Railway Corporation under the China Railway High Speed ​​CRH brand.The emergence of China`s high-speed rail has greatly shortened travel time and changed China`s society and economy. A study by the World Bank found that “the comfort, convenience, safety and punctuality of high-speed rail are favored by passengers of different income levels.” High-speed rail in China is officially defined as `newly-built passenger-dedicated rail lines designed for electrical multiple unit EMU train sets traveling at not less than 250 km/h 155 mph including lines with reserved capacity for upgrade to the 250 km/h standard on which initial service operate at not less than 200 km/h 124 mph.`EMU train sets have no more than 16 railcars with axle load not greater than 17 tonnes and service interval of not less than three minutes.In common parlance, high-speed train service in China generally refers to G-, D- and C-class passenger train service.