CJ-2 EMU is to meet China's "12th Five-Year" and later to 250 kilometers per hour EMU use demand, relying on the China Tang north car car company CRH3 high-speed EMU, CRH380B EMU industry R & D and manufacturing technology platform, innovation development of new domestic intercity EMUs, with completely independent intellectual property rights. The CJ-2 type EMU has been debugged in Tangshan for 8 months since it was rolled out in Tangshan in April 18, 2013. The performance parameters of the train have been fully tested and debugged. The train type test is a new product test for railway vehicle can meet the operational requirements of the essential link, that is to delegate the authority of inspection agencies to "test" of the new car, get the train design and manufacture license through the type test, in order to be allowed to officially launched operations. Vehicle level test car company Tang CJ-2 EMU ring iron test line in quality, including traction, braking system, network test 29, has completed 26 of them. EMU has passed the comprehensive assessment of traction performance and braking ability, through the detection of traction system against sudden failure of contact network capacity, EMU network control function test of excellent performance, the test meet the test requirements of the outline, with a speed of 160 kilometers per hour running test condition,the test operation of CJ2 EMU at Guizhou Guangzhou passenger dedicated line at present
