The NZJ "Lushan",[Note 1] also registered as the NZJ1 are a class of diesel multiple unit (DMU) of China Railway.

These sets were built by Tangshan Locomotive in a 2M2T layout of four cars with Cummins diesel engines and Siemens electrical equipment.

[2] From the mid-1990s, short distance and intercity services saw great decreases in passenger volume, due to competition from highways.

[3] In April 1997, the first such vehicle was rolled out at Tangshan Locomotive, an electrical transmission DMU, for Harbin Railway Bureau.

However, due to the short period of development and testing, the service of these sets revealed multiple flaws, and they had a very poor reliability.

This set was eventually purchased by Kunming Railway Bureau and underwent a refurbishment at Tangshan Locomotive in August 2004, and was handed over in the first half of 2005, entering service in September.

It continued to run as a passenger vehicle in either intercity or tourist services, depending on the source although the set spent much of the time as a parked at Kunming depot.

The carriages are thin-walled structures without a central supporting beam, and are connected to each other with a size H15 tightlock coupler and imported rubber gangways.

[10] Each motor car has an American Cummins QST30-G3 prime mover, which is a 12 cylinder, four stroke, water cooled, v-shaped high speed diesel engine.

As the controls for traction and electrical generation at both ends were linked to each other, the failure of one caused the other to fail as well, which resulted in the train becoming unmovable due to the loss of power.

Although the design was technically not flawed, it had tolerances that were too low and there were insufficient spare parts available, and without a diagnosis system, it was hard to locate the source of the problem.