China Railway High-speed (CRH) is a high-speed rail service operated by China Railway. The introduction of CRH series was a major part of the sixth national railway speedup, implemented on April 18, 2007. By the end of 2020, China Railway High-speed provided service to all provinces in China, and operated just under 38,000 km (24,000 mi) passenger tracks in length, accounting for about two-thirds of the world's high-speed rail tracks in commercial service. China has revealed plans to extend the HSR to 70,000 km by year 2035. It is the world's most extensively used railway service, with 2.29 billion bullet train trips delivered in 2019 and 2.16 billion trips in 2020, bringing the total cumulative number of trips to 13 billion as of 2020.