CRH380 (China Railway High-speed) Harmony bullet trains are seen at a high-speed train maintenance base in Wuhan, Hubei province, early December 25, 2012. China will open the world’s longest high-speed rail line this week when a link between Beijing and the southern metropolis of Guangzhou is inaugurated, officials said on Saturday, underscoring its commitment to a trouble-plagued transport scheme. Rail investment slowed sharply in the wake of that accident and state media reported earlier this year that the government had cut planned railway investment by 500 billion yuan ($80.27 billion) to 2.3 trillion yuan under a five-year plan to 2015. REUTERS/Stringer (CHINA – Tags: TRANSPORT SOCIETY BUSINESS TPX IMAGES OF THE DAY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA – RTR3BVZM