China, which has the world’s largest high-speed railway network, will expand its length to 50,000km by 2025

The country will also widen use of the Beidou satellite navigation system, while tightening control of transport data

China will extend its high-speed rail line nearly 32 per cent by 2025, roughly equal to the combined length of the next five largest countries by network size, amid an emerging consensus that Beijing is again leaning on infrastructure investment to curb an economic slowdown.