China Railway NYJ1

The NYJ1 is a diesel multiple unit used by China Railway, built in a power-concentrated layout in which a diesel power car at each end pushes and pulls a rake of unpowered trailer cars. It was designed and manufactured by CRRC Sifang, with CRRC Changchun Railway Vehicles building some of the sets. Developed in the late 1990s as China looked for faster short-distance intercity services, it was the Sifang answer to the NZJ diesel multiple unit from Tangshan, and its trial production was finished in December 1998. The first two sets, numbered NYJ1-4001 and NYJ1-4002, entered service in 1999 around Nanchang, and further sets followed for railway groups in Harbin, Taiyuan, Guangxi and Inner Mongolia and for the Shenhua Group. The standard formation is two power cars and four trailer cars. Each power car carries a Caterpillar 3508B diesel engine rated at 1,000 kilowatts and a hydraulic transmission also used in the DFH3 diesel locomotive, so the train is hydraulic rather than electric in transmission. Most NYJ1 power cars were withdrawn between 2010 and 2014.