The Changchun EMU or CNR Changchun EMU is an electric multiple unit train type of the Mass Transit Railway (MTR) system in Hong Kong. Designed and manufactured by Changchun Railway Vehicles, a member of CNR group, they were the first MTR heavy-rail stock to be manufactured in Mainland China, while past orders came from England, Japan, Europe or South Korea.

CRRC Changchun Railway Vehicles Co., Ltd. is a Chinese rolling stock manufacturer and a division of the CRRC. While the CRV emerged in 2002, the company's roots date back to the establishment of the Changchun Car Company in 1954. The company became a division of CNR Corporation before its merger with CSR to form the present CRRC. It has produced a variety of rolling stock for customers in China and abroad, including locomotives, passenger cars, multiple units, rapid transit and light rail vehicles. It has established technology transfer partnerships with several foreign railcar manufacturers, including Bombardier Transportation, Alstom, and Siemens Mobility.