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The China Standardized EMU ), nicknamed "Golden Phoenix" and "Dolphin Blue", is a Chinese electric high-speed train, that was developed by China Railway Corporation, which owns the independent intellectual property rights. The development started in 2012, and the plan design was finished in September 2014. The EMU was rolled off on June 30, 2015.

Development
Started in 2012, CNR Changchun Railway Vehicles (now CRRC Changchun Railway Vehicles), under the guidance of China Railway Corporation, with the collection of enterprises, universities, and research institutes, carried out the development of China Standardized EMU. In December 2013, CRRC Changchun completed developing the general technical conditions for EMUs, and completed the plan design in September 2014. The EMU was rolled off on June 30, 2015.

Test
According to the arrangement for the China Standardized EMU research and development work, the EMUs will receive 600,000-km experimental verification and optimization. They started to experimental work at National Railway Test Center of China Academy of Railway in Beijing after they rolled off, and they were tested at up to 160km/h.

On November 18, 2015, the China Standardized EMU hit a speed of 385km/h and passed the high speed test on Datong–Xi'an Passenger Railway. The EMU was tested under complicated conditions, including on bridges, in tunnels, and on slopes and turns.

On July 15, 2016, the two China Standardized EMUs in opposite directions passed each other at 420km/h (relative speed to one another of 840km/h) during test runs on Zhengzhou–Xuzhou High-Speed Railway.

Commercialization
On August 15, 2016, the China Standardized EMU has started operation on Harbin–Dalian High-Speed Railway. The train was ran as Train No. G8041 departed from Dalian North Railway Station to Shenyang Railway Station.

Specifications and Technical features
The China Standardized EMU is 209m long, 3360mm wide and 4060mm high. It has an axleload of less than 17 tonnes. The train can carry 556 passengers, with 10 in business class, 28 in first class, and 518 in second class. The train also reduces energy consumption, and adopts a standard parts design. It also has reinforced safety features compared with other EMUs.

The EMU's spacing of seat is larger than other EMUs, which the second class is 1020mm, and the first class is 1160mm. It also provides Wi-Fi access.