to Beijing via Xi'an-Zhengzhou High Speed Rail and Guangzhou-Beijing High Speed Rail, an equipment capable of 350 km/h operations must be utilized to reach regular speed on the Zhengzhou-Beijing part. With redundant power equipped for 350 km/h operations, they lose less speed going up the tunnel, thus spending less time; this has reportedly caused these trains to have to reduce speed to maintain proper separation. History Nov. 1, 2010: The Xi'an–Chengdu high-speed railway project received approval from the State Development and Planning Commission. Notes High-speed railway lines in China Rail transport in Shaanxi Rail transport in Sichuan